Question

Consider this question: What mass of concentrated solution nitric acid( 68.0% HNO3 by mass) is needed to prepare 400.0 g of a 10.0% solution of HNO3 by mass?
(a) Outline the steps necessary to answer the question
(b) Answer the question

Answer 1

Answer: The mass of concentrated nitric acid solution required is 58.82 g

Explanation:

To calculate the mass of concentrated solution, we use the equation:

$c_1m_1=c_2m_2$

where,

$c_1\text{ and }m_1$ are the concentration and mass of concentrated solution.

$c_2\text{ and }m_2$ are the concentration and mass of diluted solution.

We are given:

$c_1=68\%\\m_1=?g\\c_2=10\%\\m_2=400g$

Putting values in above equation, we get:

$68\times m_1=10\times 400\\\\m_1=58.82g$

Hence, the mass of concentrated nitric acid solution required is 58.82 g