Question

How many mL of 2.50% (m/v) NaOH solution would contain 3.50 g of NaOH?

A) 7
B) 14
C) 21
D) 28​

Answer 1

Answer:

Option (b) is the correct answer.

Explanation:

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Answer 2

The volume of NaOH will be equal to 140 mL.

Given:

The mass by volume percentage = 2.5%

Mass of NaOH =3.5g

To Find:

The volume of NaOH

Solution:

It's fairly simple to find the answer to this question, as seen below.

We know that,

Mass by volume percentage = $\frac{Mass of solute}{Volume of solution}$ × $100$

By interchanging the equation,

The volume of solution (NaOH) = $\frac{Mass of solute}{Mass by volume percentage}$ × $100$

By substituting the known values,

The volume of NaOH = $\frac{3.5}{2.5}$ × $100$

= 1.4 × 100

= 140 mL

Hence, the volume of NaOH will be equal to 140 mL.

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