Question

A solution of HNO3 is 5%(wt by at). Find the mass of HNO3 in 100 ml of solution. (density=1.4g/ml)​

Answer 1

Given that,

A solution of $HNO_{3}$ is 5%.

Let the volume of solution is x.

We know that,

Density of solution :

Density of solution is equal to the mass of solution divided by volume of solution.

In mathematically form,

$\rho=\dfrac{M}{V}$

Put the value into the formula

$1.4=\dfrac{100}{x}$

$x=\dfrac{100}{1.4}$

$x=71.4\ ml$

We need to calculate the mass of HNO₃ present in 100 ml

Using formula for mass of HNO₃

For, 71.4 ml = 5g of HNO₃

$100\ ml = \dfrac{100\times5}{71.4}$

$100\ ml =7.00\ g$

Hence, Mass of HNO₃ present in 100 ml of solution is 7g.

Answer 2

Density of solution is equal to the mass of solution divided by volume of solution. Hence, Mass  of HNO₃ present in 100 ml of solution is 7g.