Solution
Step 1 Calculate
the mole of sodium carbonate added
with the burette
Mole = volume X concentration
= 0.02311 X 0.2 = 0.0046
Step 2 Using the equation below calculate the number of mole of hydrochloric acid present required to react completely with 0.0046 mole sodium carbonate
0.0046 X 2 = 0.0092mole of hydrochloric acid in the 25ml sample.
Step 3 Find the mole of HCl in the original sample
(250/25) X 0.0092
=0.092 mole of HCl are present in the original 25ml sample of the concrete
cleaner.
Step 4 -Find the concentration of HCl in the original concrete cleaner.
mole of HCl /volume = Molarity = 0.092 /0.025 = 3.68M
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