Moles in Solutions

Question 1

What is the meaning of the solvent?

Answer 1

The solvent is the liquid in which a solute is dissolved to form a solution

Question 2

What is the meaning of the solute?

Answer 2

The solute is the minor component in a solution, dissolved in the solvent

Question 3

What is the meaning of the solution?

Answer 3

The solution is a homogenous type of mixture of two or more substances

Question 4

What is the meaning of the concentration of solution?

Answer 4

The concentration of solution is how much solute is present in a known volume of solution

Question 5

What are concentrations of solutions measured in?

Answer 5

Concentrations of solutions are measured in moldm-3

Question 6

How do you work out the number of moles in a solution?

Answer 6

Number of moles in solution = concentration (moldm-3) x volume (dm3) ÷ 1000

Question 7

Convert dm3 to cm3

Answer 7

1dm3 = 1000cm3

Question 7

Answer this question: 1.17g of sodium chloride was dissolved in water to make 500cm3 of solution. What is the concentration of solution in moldm-3

Answer 7

Concentration of solution (moldm-3) = number of moles ÷ volume (dm3)

number of moles = mass ÷ mass of one mole

1.17 ÷ (23 + 35.5) NaCl = 0.02

concentration = 0.02 ÷ (500 ÷ 1000)

concentration = 0.04 moldm-3

Question 8

How do you convert moldm-3 to gdm-3?

Answer 8

moldm-3 x Mr = gdm-3

gdm-3 divided by Mr = moldm-3