Question

1. How many grams of salt must be added to 800ml of water to prepare for 12.50% salt solution?​

Answer 1

Answer:

So you have 120 g salt800 g soln . You want to add x g of salt to get a 20 % solution. This also increases the mass of the solution by x g . You would have to add 50 g of salt.

Answer 2

The mass in grams of salt must be added to 800ml of water to prepare for a 12.50% salt solution is 100g.

Given:

A 12.50% salt solution.

To Find:

The mass in grams of salt must be added to 800ml of water to prepare for a 12.50% salt solution.

Solution;

To find the mass of salt added, we will follow the following steps:

As we know,

$\frac{w}{w} \% = 12.5\%$

This means 12.5g of salt is present in 100g or 100 ml of the solution.

(As the density of water is 1g/ml)

Now,

1 ml of water requires salt =

$\frac{12.5}{100} g$

So,

800 ml of water requires a salt =

$\frac{12.5}{100} \times 800 = 100g$

Henceforth, The mass in grams of salt must be added to 800ml of water to prepare for a 12.50% salt solution is 100g.

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