Question

A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the periodic table in the toolbar if needed.

Answer 1

The concentration of NaOH is 25.00% by mass, it means that 25.00% of the mass of the solution is of NaOH. Hence:


`m_(NaOH)=25.00\%* m_(solution)\Longrightarrow m_(NaOH)=(25)/(100)* 0.250~g\iff\\\\\boxed{m_(NaOH)=0.0625~g}`

Answer 2

Answer : The mass of NaOH present in the solution is, 0.0625 grams

Explanation : Given,

Mass % = 25 %

Mass of solution = 0.250 g

Formula used :

`Mass\%=\frac{\text{Mass of}NaOH}{\text{Mass of solution}}* 100`

Now put all the given values in this formula, we get the mass of NaOH.

`25=\frac{\text{Mass of}NaOH}{0.250g}* 100`

`\text{Mass of}NaOH=0.0625g`

Therefore, the mass of NaOH present in the solution is, 0.0625 grams