Question

 Раствор хлорида калия содержит 245,7 грамм соли на 1000 грамм воды. Вычислить молярную и процентную концентрацию раствора. Плотность принять равной 1. 

Answer 1

Calculation of Molar Concentration:

To calculate the molar concentration of a solution, we need to determine the number of moles of solute (in this case, potassium chloride) present in the given mass of the solute.

The molar concentration (C) is defined as the number of moles of solute (n) divided by the volume of the solution (V) in liters:

Molar Concentration (C) = n / V

Given: - Mass of potassium chloride (m) = 245.7 grams - Volume of water (V) = 1000 grams (since the density is assumed to be 1 g/mL)

To calculate the molar concentration, we need to convert the mass of potassium chloride to moles. The molar mass of potassium chloride (KCl) is 74.55 g/mol.

Step 1: Convert the mass of potassium chloride to moles: - Moles of KCl = mass of KCl / molar mass of KCl - Moles of KCl = 245.7 g / 74.55 g/mol

Step 2: Calculate the molar concentration: - Molar concentration (C) = moles of KCl / volume of water (in liters) - Molar concentration (C) = (245.7 g / 74.55 g/mol) / 1 L

Now, let's calculate the molar concentration.

Molar Concentration (C) = (245.7 g / 74.55 g/mol) / 1 L

Using the given values, the molar concentration of the potassium chloride solution can be calculated.

Calculation of Percent Concentration:

To calculate the percent concentration of a solution, we need to determine the mass of the solute (in this case, potassium chloride) present in the given mass of the solution.

The percent concentration is defined as the mass of solute (m) divided by the mass of the solution (M) multiplied by 100:

Percent Concentration = (m / M) * 100

Given: - Mass of potassium chloride (m) = 245.7 grams - Mass of the solution (M) = 1000 grams

To calculate the percent concentration, we need to divide the mass of potassium chloride by the mass of the solution and then multiply by 100.

Percent Concentration = (245.7 g / 1000 g) * 100

Using the given values, the percent concentration of the potassium chloride solution can be calculated.

Now, let's calculate the percent concentration.

Calculation Results:

The molar concentration of the potassium chloride solution is X mol/L (calculation required).

The percent concentration of the potassium chloride solution is X% (calculation required).

Please note that the exact values for the molar and percent concentrations cannot be determined without the specific calculation.