For the results of a titration to be concordant (in close agreement), what volume must the titres be within?
0.2 cm3
0.02 cm3
2.0 cm3
Which piece of apparatus is used to add small measured volumes of one reactant to the other reactant in a titration?
Pipette
Burette
Measuring cylinder
Why is it important to place the conical flask on a white tile when doing a titration?
Because it prevents acids and alkalis getting onto the lab bench
Because it insulates the lab bench from getting too hot
So that the colour change of the indicator is easier to see
Which part of the meniscus should be used when reading the volume of liquid in the burette?
The lowest part of the meniscus
About halfway up the meniscus
The highest part of the meniscus
What is the concentration in mol/dm3 of the solution that is formed when 50.50 g of potassium nitrate (KNO3) is dissolved in 250 cm3 of water? [Higher tier only]
0.002 mol/dm3
202 mol/dm3
2.0 mol/dm3
A student found that 25.6 cm3 of 0.3 mol/dm3 HCl were needed to neutralise a certain volume of 0.1 mol/dm3 sodium carbonate solution. What is the volume of Na2CO3(aq)? [Higher tier only]
Na2CO3 + 2HCl → 2NaCl + H2O + CO2
76.8 cm3
153.6 cm3
38.4 cm3
12.5 cm3 of aqueous HNO3 is neutralised by 25 cm3 of 0.02 mol/dm3 barium hydroxide. What is the concentration of the nitric acid? [Higher tier only]
Ba(OH)2 + 2HNO3 → Ba(NO3)2 + 2H2O
0.00008 mol/dm3
0.08 mol/dm3
0.04 mol/dm3
Ethanoic acid CH3COOH and NaOH react in a 1:1 ratio. 30 cm3 of CH3COOH was found to react with 20 cm3 of 1.5 mol/dm3 NaOH. What mass of ethanoic acid would be present in 1 dm3 of the above solution if Mr (ethanoic acid) = 60? [Higher tier only]
60 g
45 g
135 g
In an acid-alkali titration, which piece of apparatus is used to measure exactly 25.0 cm3 of alkali into the conical flask?
In a titration, the first titre value was 23.50 cm3. The next few titre values were 22.40, 22.80 and 22.90. Which two values should be used to calculate the average titre?
23.50 and 22.90
22.80 and 22.90
22.40 and 22.90