Calculating Molar Concentration

Question 1

What is a molar concentration/molarity?

Answer 1

Concentration expressed more precisely in the standard units of moles of solute per litre of solution.

Question 2

What is the formula for molar concentration and what does the formula do?

Answer 2

c=n/v
c= concentration is in mol/L or M (molar)
v=volume is mL or L (should be converted to L)
use molar mass to change:mass(in g) to moles (n) or moles (n) to mass (in g)

Question 3

What is the concentration of a solution in which 1.50 mol of copper (II) sulfate is dissolved in water to make 2.00L of solutions?

Answer 3

c=0.75 mol/L of copper(II) sulfate

Question 4

A given sample of household ammonia contains 156 g of NH3(g) dissolved in water to form 2.00L of solution. what is the concentration of the ammonia solutions?

Answer 4

c=4.58 mol/L

Question 5

A sample of water from a nearby lake is found to have a concentration of 0.90 mol/L of salt in a 50mL solution. What is the mass of salt in the sample?

Answer 5

m=2627.8g