Mason and Johns Basic Pad by Timothy Ponder

timothyp2311 — 2014-11-14 20:15:27 UTC

Apple Juice is OKAY!!!

timothyp2311 — 2014-11-14 20:15:44 UTC

.100 molar concentration of swag

timothyp2311 — 2014-11-14 20:15:51 UTC

The face you make when the indicator causes a color change

johnc0192 — 2014-11-17 19:40:10 UTC

soooooo cool

Rough Titrations

johnc0192 — 2014-11-17 19:51:28 UTC

This was a result of trying to figure out if we need to dilute the NaOH solution or not

(Post Lab 1) Titrations with a buret

johnc0192 — 2014-11-17 20:05:20 UTC

This is the real deal

GAME PLAN

johnc0192 — 2014-11-20 19:38:16 UTC

I should sharpenup my chemistry skills some

timothyp2311 — 2014-11-20 19:42:12 UTC

Pre-Lab Questions:

A solution is created by dissolving 25.0 g of NaCl in enough water to form 150. mL of solution. Determine the molarity of the solution.

n=MV25.0g/58.44g=0.428moles NaCl/0.15L= 2.85M NaCl

What is the molarity of a diluted solution if 30.0 mL of 1.25 M acetic acid is diluted to 175 mL?

M1V1=M2V2 (30.0mL)(1.25M)=(175mL)(x)x=0.214M acetic acid

Write the complete chemical equation for the reaction of a solution of sodium hydroxide and hydrochloric acid.

HCl(aq)+NaOH(aq)->NaCl(aq)+H2O(l)

How many mL of 0.10 M HCl are required to react completely with 5.0 mL of 0.10 M NaOH?

0.10M HCl(xmL)=(5.0mL)(0.10M NaOH)0.50M=0.10M(xmL)x=5.0mL HCl

If equal molar amount of NaOH and HCl are mixed, when the reaction is complete what will be the chemical species in the resulting solution?

NaCl+H2O would be the products

What will be the pH of the mixture in question 5, acidic, neutral, or basic? Explain.

The pH would be neutral as the anion of a strong acid and the cation of a strong base are both neutral.

Write the complete chemical equation for the reaction of 0.10 M solution of acetic acid (CH3COOH)with 0.10 M sodium hydroxide.

CH3COOH+NaOH--->H2O+NaCH3OO

How many mL of the 0.10 M NaOH solution will be required to react completely with 5.0 mL of a 0.10 M acetic acid (CH3COOH) solution? Explain.

5mL because the molarity of each equals one another and in M1V1=M2V2

When the reaction is complete what will be the pH (acidic, neutral, or basic)of the solution in question 8? Explain.

The solution will be basic because acetic acid is a weak acid whose anion is a weak base while sodium hydroxide’s conjugate cation is neutral.

What are two different methods for determining when a titration has reached the endpoint.

To determine the endpoint of a titration one can either use an indicator or a pH meter

How do you know when the titration has reached the endpoint for each of these methods?

The indicator will change color from change in pH will the pH meter will reveal the pH more accurately than the indicator.

slowmo titration

timothyp2311 — 2014-11-20 19:49:24 UTC

Comparison Vid

timothyp2311 — 2014-11-20 19:55:26 UTC

johnc0192 — 2014-11-20 19:58:21 UTC

(Post Lab 2&3) Final Acidity Results

timothyp2311 — 2014-11-20 20:24:59 UTC

Acid (15mL)	Acidity (M)
Sprite	1.95x10^-2
Apple Juice	1.58x10^-2
Pineapple Juice	3.02x10^-2
White Grape Juice	2.67x10^-2
Orange Juice	3.91x10^-2

(Post Lab 4) I need to...

timothyp2311 — 2014-11-23 22:39:01 UTC

The beverage with the highest acidity content was my sweet sweet orange juice. Because of this I've decided to stop consuming it completely just as the doctor recommended. Based on acidity the beverages ranking from best to worst are as follows:

1. Apple Juice

2. Sprite

3. White Grape Juice

4. Pineapple Juice

5. Orange Juice

(Post Lab 6) Yet Another's Mistake

timothyp2311 — 2014-11-24 02:55:19 UTC

If an air bubble was released before the equivalence point then it would illusion that more titrant was needed for the solution, causing the calculations to be incorrect and concluding with a higher acidity then it truly is.

(Post Lab 7)What If?

timothyp2311 — 2014-11-24 03:01:10 UTC

The concentration of citric would change significantly if the other acids present were taken into consideration. The concentration would have been significantly lower, as other acids would apply their own acidities to the pH equivalence point alongside citric acids own.

(Post Lab 5) Another's Mistake

timothyp2311 — 2014-11-24 15:01:33 UTC

If another student had rinsed their buret with water but neglected washing it with the titrant, then the titrant would have diluted before entering the solution. This dilution would have caused the acid's acidity to appear higher than it actually is for more of the titrant would have been needed.

(Post Lab 2) Calculations

timothyp2311 — 2014-11-24 19:06:59 UTC

0.1MNaOH=(xmoles)/_______LNaOH

(xmoles NaOH)(1 HC6H5O7/3moles NaOH)

molesHC6H5O7/0.025L=Molarity

-log(Molarity)=pH