Achemist has 100g of 25% acid solution. how much of these solution he needs to drain and replace with 70% acid solution to obtain 100g of 60% acid solution?

77.78 grams

Given:

A chemist has 100g of 25% acid solution.

Question:

How much of these solution he needs to drain and replace with 70% acid solution to obtain 100g of 60% acid solution?

The Process:

We will solve the chemical problem of mixed concentration. A chemist wants to get an acid solution with new concentrations. He needs to drain the initial solution and replace it with another concentration of an acid solution.

Let's arrange the equations.

We work on Equation-2 first.

Substitute Equation-1 to Equation-2.

Therefore,

Thus, he needs to drain

Keywords: a chemist, has 100g, 25% acid solution, how much, he needs, to drain, and replace with, 70%, to obtain, 60%, mixed, initial, new

-2 is the right