# How many grams of potassium hydroxide must be added to 40 g of a 10% solution to get a 40% solution?

May 28, 2020 | Education

| ω = m (substance) / m (solution)

Find the mass of alkali m = 40 * 0.1 = 4 g

ω = m (substance) / m (solution), let x be the mass of alkali to be added, then:

0.4 = (4 + x) / (40 + x)

16 + 0.4x = 4 + x

x = 20 g

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.