Question

Рассчитайте массу соляной кислоты для приготовления 150мл 0.5М расствора соляной кислоты. СРОЧНО! ДАМ 100 БАЛЛОВ

Answer 1

Ответ:

m(HCl)=nM n=CmV

n(HCl)=0.15*0.5=0,075 моль

m(HCl)=0.075*36.5=2,7375 грамма

Answer 2

Calculating the Mass of Hydrochloric Acid for a 0.5M Solution

To calculate the mass of hydrochloric acid needed to prepare a 150ml 0.5M solution, we can use the formula:

Molarity (M) = moles of solute / volume of solution in liters

First, let's calculate the moles of solute required for the solution.

Calculating Moles of Solute

The formula to calculate moles of solute is: moles = Molarity x Volume (in liters)

Given: - Molarity (M) = 0.5M - Volume of solution = 150ml = 0.15 liters

Using the formula: moles = 0.5M x 0.15L = 0.075 moles

Calculating the Mass of Hydrochloric Acid

The molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol.

To find the mass of hydrochloric acid needed, we can use the formula: mass = moles x molar mass

Substituting the values: mass = 0.075 moles x 36.46 g/mol = 2.7355 grams

Therefore, to prepare a 150ml 0.5M solution of hydrochloric acid, approximately 2.7355 grams of hydrochloric acid is needed.