chemsheets concentration 01

© The concentration of a solution is usually measured in moles per cubic decimetre (mol/dm 3 ). This is a measure of the number of moles in one cubic decimetre. The volume must be in dm 3 (there are 1000 cm 3 in 1 dm 3 ). vol in dm 3 = vol in cm 3 1000 concentration (mol/dm 3 ) = moles volume (dm 3 ) moles conc vol (dm 3 ) 1) Calculate the concentration of the following solutions in mol/dm 3 . a) 0.1 moles of NaCl in 200 cm 3 . b) 0.2 moles of H 2 SO 4 in 100 cm 3 ... c) 0.02 moles of NaOH in 25 cm 3 ... 2) Calculate the number of moles in the following solutions. a) 100 cm 3 of 0.20 mol/dm 3 HNO 3 .. b) 25 cm 3 of 1.50 mol/dm 3 KOH .. c) 50 cm 3 of 0.10 mol/dm 3 H 2 SO 4 ... Concentration can also be measured in grams per cubic decimetre (g/dm 3 ). This is a measure of the number of grams in one cubic decimetre. [remember that mass = M r x moles] 1 dm 3 2 moles of H 2 SO 4 196 g of H 2 SO 4 Concentration = 2 mol/dm 3 M r of H 2 SO 4 = 98 Concentration = 2 x 98 =196 g/dm 3 A simple conversion is: conc (g/dm 3 ) = conc (mol/dm 3 ) x M r 3) Calculate the concentration of the following solutions in g/dm 3 . a) 0.100 mol/dm 3 NaOH ... b) 0.250 mol/dm 3 CH 3 COOH ... c) 1.50 mol/dm 3 HNO 3 ...... 4) 0.2 moles of NaOH is dissolved in 250 cm 3 of water. a) Calculate the concentration in mol/dm 3 . .. b) Calculate the concentration in g/dm 3 . ... ... 5) 5 g of KNO 3 is dissolved in 100 cm 3 of water. a) Calculate the concentration in g/dm 3 . .... b) Calculate the concentration in mol/dm 3 . ... ...

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The concentration of a solution is usually measured in moles per cubic decimetre (mol/dm

3). This is a measure of the number of moles in one cubic decimetre.

The volume must be in dm

3 (there are 1000 cm

3 in 1 dm

3). vol in dm

3 = vol in cm

1000

concentration (mol/dm

3) = moles

volume (dm3)

moles

conc vol (dm3)

1) Calculate the concentration of the following solutions in mol/dm

a) 0.1 moles of NaCl in 200 cm3 #######################.

#####################################

b) 0.2 moles of H2SO4 in 100 cm3 ######################...

#####################################

c) 0.02 moles of NaOH in 25 cm3 ######################...

#####################################

2) Calculate the number of moles in the following solutions.

a) 100 cm3 of 0.20 mol/dm

3 HNO3 ######################..

#####################################

b) 25 cm3 of 1.50 mol/dm

3 KOH #######################..

#####################################

c) 50 cm3 of 0.10 mol/dm

3 H2SO4 #.#####################..

#####################################

Concentration can also be measured in grams per cubic decimetre (g/dm

3). This is a

measure of the number of grams in one cubic decimetre. [remember that mass = Mr x

moles]

1 dm3

2 moles of H2SO4

196 g of H2SO4

Concentration = 2 mol/dm3

Mr of H2SO4 = 98 Concentration = 2 x 98 =196 g/dm

A simple conversion is: conc (g/dm3) = conc (mol/dm

3) x Mr

3) Calculate the concentration of the following solutions in g/dm

a) 0.100 mol/dm

3 NaOH ##########################...

##################################### b) 0.250 mol/dm

3 CH3COOH ########################...

##################################### c) 1.50 mol/dm

3 HNO3 #########...#################...

##################################### 4) 0.2 moles of NaOH is dissolved in 250 cm

3 of water.

a) Calculate the concentration in mol/dm

3. ##################..

b) Calculate the concentration in g/dm3. ################.##..

####################################...

5) 5 g of KNO3 is dissolved in 100 cm3 of water.

a) Calculate the concentration in g/dm

3. ###############..####..

b) Calculate the concentration in mol/dm3. #################.#..

####################################...

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