Question

300g 30℅ w/w naoh solution is mixed with 500g 40℅w/w naoh solution find the mass ℅ w/w of final solution

Answer 1

Answer : The mass ℅ w/w of final solution is, 36.25 %

Explanation :

First we have to calculate the mass of solute.

As per to question,

300 g of 25% solution contains solute = $\frac{(300\times 30)}{100}=90g$

And,

500 g of 40% solution contains solute = $\frac{(500\times 40)}{100}=200g$

Total mass of solute = 90 + 200 = 290 g

The total mass of solution = 300 + 500 = 800 g

Now we have to calculate the mass ℅ w/w of final solution.

$\text{Mass }\%\text{ of final solution}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$

$\text{Mass }\%\text{ of final solution}=\frac{290g}{800g}\times 100=36.25\%$

Therefore, the mass ℅ w/w of final solution is, 36.25 %