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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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1. With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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1. With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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Type your answers here: Yes it is valid, because there is an independent variable and a dependant variable while there is a variable kept constant throughout the experiment

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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [ 3   ]
(b)What is your sample size? [ 5   ]
(c) How many times will you repeat the experiment again? [ 3   ]

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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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1. With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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1. With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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Type your answers here: It is valid, because the outcome of the experiment is due to the only (one) independent variable (the other variables are fixed/controlled.)

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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Type your answers here: yes, there is a manipulated variable and a response variable >.<

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain

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Type your answers here: It is valid, because we are changing only one variable and keeping everything else constant, there is also a dependent variable we can observe change in.

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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Type your answers here: Valid, as there is only one independent variable and one dependent variable.

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [  3 ]
(b)What is your sample size? [ 4  ]
(c) How many times will you repeat the experiment again? [ 3   ]

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [  3  ]
(b)What is your sample size? [ 5
]
(c) How many times will you repeat the experiment again? [  3  ]

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here: -beaker
-conical flask
-volumetric flask
-white tile
-timer
-sodium thiosulfate
-Hydrochloric acid
-Glass rod
-Measuring Cylinder

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Type your answers here:
1. Measure out the different solutions
2. 60 mL of sodium thiosulfate solution in to a conical flask
3. 20 mL of HCL
4. Draw an X on a piece of paper and place the conical flask on top of it
5. React the sodium thiosulfate with HCL
6. Record the time taken for the X to disappear
7. Repeat the experiment with 5 different concentration of sodium thiosulfate by diluting them

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [  3]
(b)What is your sample size? [  4  ]
(c) How many times will you repeat the experiment again? [  2  ]

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [  3  ]
(b)What is your sample size? [   5 ]
(c) How many times will you repeat the experiment again? [   2 ]

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here:
Conical flask
Stopwatch
Thermometer
Stand and clamp
Water bath
Hydrochloric acid
Sodium Thiosulfate

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1. Using a measuring cylinder, add 50 cm3 of dilute sodium thiosulfate solution to a conical flask.
2. Place the conical flask on a piece of paper with a black cross drawn on it.
3. Using a different measuring cylinder, add 10 cm3 of dilute hydrochloric acid to the conical flask.
4. Immediately swirl the flask to mix its contents and start a stop clock.
5. Measure and record the temperature of the reaction mixture.
6. Look down through the reaction mixture. When the cross is no longer visible, record the time on the stop clock.
7. Measure and record the temperature of the reaction mixture, and clean the apparatus as directed by the teacher.
8. Repeat steps 1 to 6 with different starting temperatures of sodium thiosulfate solution

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here:
Hydrochloric acid solution (HCl) 2 M, 25 mL Graduated cylinders, 10-mL, 5Sodium thiosulfate solution, (Na2S2O3) 0.15 M, 150 mL, White tile, Distilled or deionized water Permanent marker, Beakers, 100-mL, 5 Stirring rods, Graduated cylinders, 50- or 100-mL, 2 Stopwatch or timer

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here:
100mL 2 molL-1 HCl
200 1 molL-1 Na2S2O3
Distilled Water
Burette
Pipette
Beakers
White Tile
Stopwatch
Red Marker Pen

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here:
Apparatus: Conical flask, measuring cylinder, water bath, white paper, marker, thermometer, beaker, stopwatch
Materials: Hydrochloric acid, sodium thiosulphate, water

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Type your answers here:
1. Label five 100-mL beakers 1–5 and clean the bottom of each beaker.
2. Draw a large “X” across the bottom on the outside of each beaker. Place the beakers on an overhead projector stage ora light box to view the “X.”
3. Using separate graduated cylinders for the solution and water, measure and add the required amounts of 0.15 M sodium thiosulfate and distilled water to each beaker. Calculate the final concentration of sodium thiosulfate in each beaker 1–5.5.
4. Record in a data table.
5. Measure 5.0 mL of 2 M hydrochloric acid into each of five 10-mL graduated cylinders. Starting with beaker #1, carefully add the HCl all in one pour to the sodium thiosulfate solution.
7. Stir the solution once with a stirring rod and immediately start timing.
8. Stop timing when the black “X” is no longer visible. Record the reaction time in seconds in the data table.
9. Repeat steps 7 and 8 with beakers 2–5.10. Calculate 1/reaction time for each trial.

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Type your answers here:
1) Pipette 25mL Na2S2O3 into a beaker. Place the beaker on top of the White Tile which has a Red X marked on it.
2) Pipette 25mL of 2molL-1 HCl into a beaker. Then pour the HCl into the beaker with Na2S2O3 and start the timer.
3) Once the Red X is no longer visible from the beaker, stop the timer. Record the time taken in a table.
4) Repeat the experiment twice and obtain an average.
5) Pippette 25mL of 2molL-1 HCl and 25mL of distilled water into a beaker to obtain a 1molL-1 HCl. Stir till all species are mixed.
6) Repeat Step 1 to Step 5 with 1molL-1 HCl, 0.5molL-1 HCl, 0.25molL-1 HCl instead of 2molL-1 HCl.
7) Repeat everything one more time and obtain the average.
8) Plot a graph with the given data in the table and conclude the experiment.

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Type your answers here:
1. 50 cm3 of 0.2 mol dm–3

sodium thiosulphate solution is measured using a 50 cm3

measuring cylinder and poured into a conical flask.
2. 10 cm3 of 1.0 mol dm HCl is measured using a 10 cm measuring cylinder

3. 10 cm3 of 1.0mol dm HCl is immersed in a water bath and raised to a temperature of 30C

4. The conical flask is placed on top of a piece of white paper with a mark ‘X ‘ at the centre.

5 . The HCl is poured quickly and carefully into the conical flask. At the same time,

stopwatch is started immediately.

6. The mixture in the conical flask is swirled for a few time. It is then placed back on the white

paper.observed vertically from the top.

7.The stopwatch is stopped immediately once the mark ‘X‘ disappear from sight. The time required for the mark ‘X‘ to disappear from sight is recorded.

8. Each temperatureb is repeated 3 times to find the average time taken for the X mark to disappear.

9. The experiment is repeated using 50 cm^3 0.2 mol dm –3sodium thiosulphate solution at 40C, 50C, 60C and 70C respectively. All other conditions remain unchanged.

10. The results are recorded

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The method of your investigation is a step-by-step procedure. When detailing the method, ensure it is a valid, reliable and accurate investigation.

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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1.With reference to the variables which you have done on Day 1, are you convinced that your experiment is valid? Explain.

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Type your answers here: Valid, because there is only one independent variable which is the concentration of hydrochloric acid and there is one dependent variable which is the time taken for the 'X' mark to disappear. The dependent variable can be measured reliably.

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2. How reliable is your method? *Type your answers in the bracket*

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2. How reliable is your method? *Type your answers in the bracket*

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(a) How many repetitions for each reading are you doing? [  3  ]
(b)What is your sample size? [  4  ]
(c) How many times will you repeat the experiment again? [  3 ]

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3. List the materials and apparatus required for your experiment.

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3. List the materials and apparatus required for your experiment.

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Type your answers here: Stopwatch, Conical flask, Beaker, Pipette, Volumetric flask, White tile, Dropper, 0.1mol/L Sodium thiosulfate, 0.1mol/L Hydrochloric acid, Distilled water

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Type your answers here:

1) Measure 50ml of 0.1mol/L hydrochloric acid into a beaker.
2) Pipette 25ml of the hydrochloric acid into a 250ml volumetric flask.
3) Add distilled water until the calibration mark is reached and transfer this solution to a beaker and label it solution B.
4) Pipette 25 ml of solution B into another 250ml volumetric flask and add distilled water until the calibration mark. Transfer this solution into a beaker and label it solution C.
4) Pipette 25 ml of solution C into another 250ml volumetric flask and add distilled water until the calibration mark. Transfer this solution into a beaker and label it solution D.
5) Pipette 25ml of the 0.1mol/L sodium thiosulfate into a conical flask.
6) Draw a 'X' mark on a piece of paper and place it in between the conical flask and the white tile.
7) Measure 25ml of solution A and pour it into the conical flask. Start the stopwatch simultaneously. Swirl  the mixture slightly then place it back on the white tile
8) Record the time taken for the 'X' mark to disappear in a table.
9) Repeat procedure 5 to 8 for  solution B,C and D and record the data obtained.
10) Repeat the experiment for each concentration of hydrochloric acid to obtain an average of the time taken for the 'X' mark to disappear.