Question
Asked Oct 17, 2019
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Exactly 19.36 mL of 0.1481 M NaOH is used to titrate a 25.00 mL sample of HF. What is the concentration of the hydrofluoric acid?

How many moles of NaOH were used? 

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Expert Answer

Step 1

The balanced chemical equation for the reaction is given below.

Na OH+HF NaF+H,O
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Na OH+HF NaF+H,O

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Step 2

1 mol HF needs 1 mol NaOH for neutralization.

Number of equivalence of acid = Number of equivalence of base

Macid x Vacid = Mbase x Vbase

And numbe...

V
М.х
М,
V
acid
base
base
acid
М. хV.
base
М.
base
acid
acid
(0.1481M 19.36 mL)
25 mL
=0.114M,concen tration of HF
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V М.х М, V acid base base acid М. хV. base М. base acid acid (0.1481M 19.36 mL) 25 mL =0.114M,concen tration of HF

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