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Determine the concentration of hydrochloric acid using a 0.200 M KOH solution. A total of 30.00 mL of KOH is required to titrate 20.00 mL of HCl to the equivalence point.
HCl + KOH → KCl (aq) + H2O
Step 1: Calculate millimoles (mmol) of KOH used:
mmol KOH = Molarity × Volume
= 0.200 M × 30.00 mL
= 6.00 mmol
Step 2: Relate to HCl (1:1 reaction ratio)
Since the reaction between HCl and KOH is 1:1,
mmol HCl = 6.00 mmol
Step 3: Calculate the Molarity of HCl:
Molarity of HCl = mmol of HCl Volume of HCl
Molarity of HCl = 6.00 mmol 20.00 mL
Molarity of HCl = 0.300 M
Therefore, the concentration of hydrochloric acid is 0.300 M.
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