ACIDS & BASES - GR9 by Lizelle Swanepoel https://padlet.com/lizellexs/edfkl4bjzt3t en-us 2019-10-02 13:23:04 UTC 2025-10-10 11:35:27 UTC hello@padlet.com https://padlet.pics/1/image.webp?t=g_auto&url=https%3A%2F%2Fpadlet.net%2Ficons%2Fpng%2F1f34b.png lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392418783 2019-10-02 13:24:57 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392418783 pH and the pH scale lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419606
  • pH stands for “power of hydrogen”
  • The pH scale is a measure of the H+ ion concentration of a substance in water.
  • Explain qualitatively the pH range of 0 to 14
  • Below is a strip of Universal Indicator:
    • ]]>     2019-10-02 13:26:00 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419606     pH of different substances lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419678 2019-10-02 13:26:07 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419678 Importance of pH in our oceans lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419790 Formation of carbonic acid]]> 2019-10-02 13:26:15 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419790 Importance of pH in our muscles lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419928 Optimal functioning of myosin at pH 6]]> 2019-10-02 13:26:24 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392419928 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420063 2019-10-02 13:26:33 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420063 ACID STRENGTH TEST lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420268 2019-10-02 13:26:48 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420268 Factors affecting electrical conductivity of a acid or alkali lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420464 How well a substance forms ions in solution, determines its conductivity. 
    • Strong acids and alkalis ionize completely, therefore they have a large concentration of free ions in solution which makes them highly conductive. 
    • Weak acids and alkalis ionize only partially, therefore have a low concentration of free ions in solution which gives them poor conductivity.
    ]]>     2019-10-02 13:27:04 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420464     Household indicators lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420831 2019-10-02 13:27:32 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392420831 Indicators lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421017 Indicators are WEAK ACIDS which indicate the acidity/alkalinity of a substance by changing colour. 

    Examples:
    • Litmus 
    • Universal indicator 
    • Phenolphthalein 
    ]]>     2019-10-02 13:27:47 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421017     lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421333 2019-10-02 13:28:09 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421333 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421418 2019-10-02 13:28:15 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421418 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421678 2019-10-02 13:28:36 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421678 NEUTRALIZATION lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421786
    Neutralization = The reaction of an acid with a base to produce a salt and water. 

    • Acids release H+  into solution.
    • Bases release OH- into solution. 
    • If we were to mix an acid and base together, the H+ ion would combine with the OH- ion to produce the molecule H2O.
    ]]>     2019-10-02 13:28:45 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421786     Examples: lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421879 2019-10-02 13:28:53 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392421879 WHAT IS TITRATION? lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392422117
  • DEF OF TITRATION = A technique for determining the concentration of an acidic or basic solution. The solution with known concentration is added to the solution of unknown concentration in a very controlled way to neutralise it by forming a salt and water. 
  • A salt = A substance in which the hydrogen of an acid has been replaced by a cation, e.g. NaCl

    • ]]>     2019-10-02 13:29:12 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392422117     Titration jargon lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392422226

  • Standard solution = A solution of known concentration. 

  • Indicator = A substance that changes colour to indicate the acidity or basicity of a compound. 

  • End point = The point where the indicator changes colour.

    • ]]>     2019-10-02 13:29:47 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/392422226     WATCH THIS VIDEO AS INTRO lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/397749340 2019-10-15 06:11:09 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/397749340 WORK THROUGH THIS lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716455060 2020-09-02 23:02:39 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716455060 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716467081 2020-09-02 23:12:46 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716467081 SOME COMMON ACIDS lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716468153 2020-09-02 23:13:46 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716468153 EXAMPLES OF ACIDS IN FOOD lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716469257 2020-09-02 23:14:37 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716469257 SOME COMMON BASES lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716470114 2020-09-02 23:15:25 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716470114 EXAMPLES OF BASES lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716471300 2020-09-02 23:16:28 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716471300 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716472188 2020-09-02 23:17:11 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716472188 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716472901 2020-09-02 23:17:46 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716472901 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716474720 2020-09-02 23:19:13 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716474720 DILUTING AN ACID - PROCEDURE lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716475228 2020-09-02 23:19:39 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716475228 HOMEWORK lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716476649 2020-09-02 23:20:40 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/716476649 pH indicators lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728607828 PhET simulation of acids and bases pH with universal indicator
    Click to Run]]>     2020-09-08 18:13:29 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728607828     lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728700937 2020-09-08 18:31:23 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728700937 UNIVERSAL INDICATOR WITH DRY ICE lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728734995 2020-09-08 18:38:18 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728734995 pH paper testing acids and bases lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728804378 2020-09-08 18:53:20 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728804378 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728848298 2020-09-08 19:04:09 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728848298 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728849767 2020-09-08 19:04:33 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728849767 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728851197 2020-09-08 19:04:55 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728851197 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728852698 2020-09-08 19:05:18 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728852698 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728854923 2020-09-08 19:05:53 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728854923 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728856198 2020-09-08 19:06:13 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728856198 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728857970 2020-09-08 19:06:38 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728857970 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728859472 2020-09-08 19:07:00 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728859472 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728911400 2020-09-08 19:20:44 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/728911400 ACID + BASE lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742111902 2020-09-13 19:24:39 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742111902 ACID + METAL lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742114042 2020-09-13 19:27:02 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742114042 ACID + METAL OXIDE lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742139667 and other reactions]]> 2020-09-13 19:57:28 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742139667 ACID + METAL CARBONATE lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742140347 2020-09-13 19:58:16 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742140347 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742164317 2020-09-13 20:27:36 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742164317 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742165530 2020-09-13 20:29:12 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/742165530 NEUTRALISATION VIA TITRATION lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/770265070 2020-09-22 23:02:06 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/770265070 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2311357489 2022-09-24 07:59:42 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2311357489 PHET SIM ON ACID STRENGTH lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2318941598 2022-09-29 07:53:23 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2318941598 EXERCISES 1-3 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2334191035 2022-10-10 20:52:34 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2334191035 NOTES lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2750128094 2023-10-17 05:26:41 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2750128094 WORKSHEET FOR MARKS - DO EXERCISE 1 & 2 lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2750137426 2023-10-17 05:34:30 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2750137426 REACTIVITY LIST lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2758975307
  • Elements higher up are more reactive than those lower down and will be oxidised by elements lower down.
  • Acids only react with metals above Hydrogen on the list.

    • ]]>     2023-10-23 12:07:26 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2758975307     lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2764549371 2023-10-26 11:34:41 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2764549371 Exercise on acid reactions lizellexs https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2764549437 2023-10-26 11:34:44 UTC https://padlet.com/lizellexs/edfkl4bjzt3t/wish/2764549437