# How much salt should be added to 500 g of a 10% salt solution to make the salt solution 25%?

May 27, 2021 | education

| From this task it follows that it is necessary to find the mass of salt, which must be added to a 10% solution.

In order to solve this problem, you first need to find the mass of salt in a 10% solution.

For this we use the following formula

W = m r.v. / m p-pa × 100%

We substitute the data and we get the following:

0.1 = x / 500

We find x from the resulting equation and we get the following solution:

x = 0.1 × 500

x = 50 g

It turns out that a 10% solution contains 50 grams of salt.

Next, we compose the equation

0.25 = (50 + x) ÷ (500 + x)

50 + x = 125 + 0.25 x

0.75 x = 75

x = 100 g

Answer: 100 grams of salt must be added to a 10% solution to make it a 25% solution.

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