CHEM 12 EVERYDAY ACID LAB
To find the the pH and concentration of our everyday acid. We chose warheads, which has malonic acid.
250ml erlenmeyer flask, 100 ml beaker, graduated cylinder, burette, warheads candy, scale, funnel, filter, phenolphthalein, 0.1 M NaOH (50mL), water (100 mL)
Grind up warheads candy into powder using mortar and pestle.
Mix 10g of warheads powder with 100mL of water.
Filter 10mL of water/warhead mixture into a flask (repeat two more times).
Titrate each time 10 mL is filtered with NaOH.
try 1: 0-7.1 (7.1 difference)
try 2: 7.1-13.9 (6.8 difference)
try 3: 13.9-21.1 (7.2 difference)
10ml of mixture
10g of powder, 0.5g acid- 0.5ml acid
average of 7ml used NaOH
0.1 M x 0.007 L = 0.0007 moles NaOH M1V1=M2V2
0.0007 moles acid
-log(0.0007)= pH 3.15
The pH of malonic acid is 3.15. The [H3O] is [0.0007].