Question

In a titration of 250.0 mL of methanoic acid (HCHO2), takes 16.32 mL of 0.1004 mol/L NaOH to reach the end-point. What is the molar concentration of the methanoic acid?

Answer 1

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Step 1. Write the balanced equation

HCOOH + NaOH

→

HCOONa

+

H

2

O

Step 2. Calculate the moles of NaOH

Moles of NaOH

=

0.016 32

L NaOH

×

0.1004 mol NaOH

1

L NaOH

=

0.001 639 mol NaOH

Step 3. Calculate the moles of

HCOOH

Moles of HCOOH

=

0.001 639

mol NaOH

×

1 mol HCOOH

1

mol NaOH

=

0.001 639 mol HCOOH

Step 4. Calculate the molarity of the

HCOOH

Molarity of HCOOH

=

moles

litres

=

0.001 639 mol

0.250 00 L

=

0.006 556 mol/L