How do I find the concentration of the HCOOH solution?

[匿名]

2016-02-19 11:11 pm

You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate this with a 0.1105 M NaOH. You add 20.00 mL of HCOOH to the beaker before titrating, and it requires 35.43 mL of NaOH to reach the end point. What is the concentration of the HCOOH solution?
You are given a solution of (formic acid) with an approximate concentration of 0.20 and you will titrate this with a 0.1105 . You add 20.00 of to the beaker before titrating, and it requires 35.43 of to reach the end point. What is the concentration of the HCOOH solution?
A 0.1958 M
B 0.0624 M
C 0.1105 M
D 0.2000 M

回答 (1)

andrew

2016-02-19 11:21 pm

✔ 最佳答案

HCOOH + NaOH → HCOONa + H₂O

No. of moles of NaOH = 0.1105 × (35.43/1000) = 0.003915 mol

From the equation, 1 mol of HCOOH reacts with 1 mol of NaOH.
No. of moles of HCOOH = 0.003915 mol

Molarity of HCOOH = 0.003915 / (20.00/1000) = 0.1958 M

...... The answer is : A. 0.1958 M

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