Question

Помогите, писать только знающим людям К 135 г 10%-ного раствора азотной кислоты добавили гидроксид калия. Вычислите массу образовавшейся соли.

Answer 1

HNO3 + KOH = KNO3 + H2O
m (HNO3) ч = 135г*0.1= 13,5 г 
n(HNO3) = 13.5/63= 0.214 моль = n(KNO3)
m(KNO3) = 0.214*101=21.615 г

Answer 2

Calculation of the Mass of the Formed Salt

To calculate the mass of the formed salt when 10% nitric acid solution is added to potassium hydroxide, we need to know the balanced chemical equation for the reaction between nitric acid (HNO3) and potassium hydroxide (KOH).

The balanced chemical equation for the reaction between nitric acid and potassium hydroxide is as follows:

HNO3 + KOH → KNO3 + H2O

From the balanced equation, we can see that 1 mole of nitric acid reacts with 1 mole of potassium hydroxide to produce 1 mole of potassium nitrate and 1 mole of water.

To calculate the mass of the formed salt, we need to know the amount of nitric acid used. In this case, we are given that 135 g of 10% nitric acid solution is used.

To determine the amount of nitric acid in the solution, we need to calculate the mass of nitric acid in the solution. Since the solution is 10% nitric acid, it means that 10 g of the solution contains 1 g of nitric acid. Therefore, the mass of nitric acid in 135 g of the solution is:

Mass of nitric acid = (10/100) * 135 g = 13.5 g

Now, we can calculate the amount of nitric acid in moles using its molar mass. The molar mass of nitric acid (HNO3) is approximately 63.01 g/mol.

Amount of nitric acid in moles = Mass of nitric acid / Molar mass of nitric acid = 13.5 g / 63.01 g/mol

Next, we can use the balanced chemical equation to determine the amount of potassium nitrate formed. From the balanced equation, we know that the molar ratio between nitric acid and potassium nitrate is 1:1.

Therefore, the amount of potassium nitrate formed is equal to the amount of nitric acid used.

Finally, we can calculate the mass of the formed salt, potassium nitrate (KNO3), using its molar mass. The molar mass of potassium nitrate is approximately 101.1 g/mol.

Mass of formed salt = Amount of potassium nitrate * Molar mass of potassium nitrate

Let's calculate the mass of the formed salt:

Mass of formed salt = Amount of nitric acid in moles * Molar mass of potassium nitrate

Please note that the molar mass values used here are approximate and may vary slightly depending on the source.