Basic Molarity and Concentration Calculations Leaving Cert

A student dissolves 2g of a substance in 500ml of water. What is a concentration in grams per litre

• 1g/l

• 2 g/l

• 0.5 g/l

• 0.002 g/l

A student dissolved 4 g of a substance in 100ml of water. What is the concentration of the solution in PPM

• 40 PPM

• 4 PPM

• 400 PPM

• 4000 PPM

Molarity is measured in _____.

• moles per g.

• mols per L.

• moles per mm.

• moles per mL.

Molar mass of NaOH is ______________________

Please use your periodic table from your books

• 40 grams/mol

• 50 grams/mol

• 45 grams/mol

• 38 grams/nol

A Student picks up a 1 litre volumetric flask labeled 2M NaCl. How many grams of Sodium Chloride are present in this bottle.

(Na = 23, Cl = 35.5)

• 58.5 g

• 117 g

• 28 g

• 2000 PPM

What is the molarity of 3 mole of hydrochloric acid in 3 L of water. 

• 3
• 1
• 6
• 9

How many moles of NaCl are present in a solution with a molarity of 8.59M and 125 mL of solution?

(Na = 23, Cl = 35.5)

• 1.07 gram

• 62.7 mol

• 1.07 mol

• 62.7 grams

The ___ is the thing being dissolved

• solute
• solvent

What is the molarity of a solution which contains 22.41 grams of NaCl in 50.0 mL of solution?

• 0.488 M
• 7.67 mol
• 7.67 M
• 0.00767 M

A student had a standardised 4M solution of HCl . How many moles of Sodium Carbonate would he need to react completely with 2 litres of this solution.

• 1 mole

• 2 mole

• 4 mole

• 8 mole