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========================== Topic 1 and 2 revision. Must recall the ion tests. Should calculate moles equations. Could calculate titration equations. ========================== Starter: What is the difference between quantitative and qualitative tests.

Cation tests. List the flame tests and how they are done. Precipitate tests using NaOH Testing for ammonia. Create an A4 summary sheet… you will have to present this!

Anion tests Halogen ion tests (Cl-, Br- and I-) Test for carbonate ions. Test for sulfate ions. Create an A4 summary sheet… you will have to present this!

Redissolves when excess NaOH used Lilac Precipitate Yellow Green precipitate NH4+ AgNO3 Redissolves when excess NaOH used Damp blue litmus. BaCl2

Moles How many moles are there in 82 g of 23Na? How many moles are there in 260 g of Calcium? What is the mass of 7 moles of 238U? What is the Mr of a substance where 1 mole has a mass of 16 g?

More moles. How many moles are there in 308g of CO2 ? What is the mass of 7 moles of Na2O ? What is mass of 4 moles of Platinum? How many moles are there in 264g of SO2?

Concentration

Converting You may also need to know that ... mole conc. (mol/dm3 ) x formula mass = mass concentration (g/dm3 ) mass conc. (g/dm3 ) / formula mass = mole concentration (mol/dm3)

Questions What is the mass concentration of sodium chloride (NaCl) in g/dm3 in a 1.50 mol/dm3 solution? At. masses: Na = 23, Cl = 35.5, formula mass NaCl = 23 + 35.5 = 58.5 mass conc. = mol conc. x formula mass Mass conc. In g/dm3 = 1.50 x 58.5 = 87.8 g/dm3

Calculate the concentration in (a) g/dm3 and (b) mol/dm3. A solution of calcium sulphate (CaSO4) contained 0.500g dissolved in 2.00 dm3 of water. Calculate the concentration in (a) g/dm3 and (b) mol/dm3. (a) concentration = 0.500/2.00 = 0.250 g/dm3 (b) At. masses: Ca = 40, S = 32, O = 64, f. mass CaSO4 = 40 + 32 + (4 x 16) = 136 moles CaSO4 = 0.5 / 136 = 0.00368 mol concentration CaSO4 = 0.00368 / 2 = 0.00184 mol/dm3

Making soluble salts (1)

Concentration = no. of moles volume Learn this formula triangle! m c v number of moles concentration (in mol dm-3) volume (in dm3)

Titration calculations cont. In a titration, 25 cm3 of 2.0 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide? In a titration, 25 cm3 of 0.2 mol dm-3 HCl reacted with 75 cm3 of NaOH. What was the concentration of the sodium hydroxide?

Review Was the revision session useful? How? What new learning did you get from today’s lesson.