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WorksheetsVolumetric Analysis 2
Total questions: 10
Worksheet time: 26mins
Solid sodium hydroxide CANNOT be weighed accurately for preparing a standard solution because
it is corrosive.
it decomposes easily.
it is volatile.
it absorbs moisture from the air.
The following diagram shows the initial and final burette readings.
What was the volume of sodium hydroxide solution used?
28.20 cm3
28.80 cm3
29.20 cm3
29.80 cm3
25.0 cm3 of sodium hydroxide solution is tritrated against 0.200 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.
Which of the following pieces of apparatus should be used to transfer 25.0 cm3 of the sodium hydroxide solution?
Burette
Measuring cyclinder
Pipette
Volumetric flask
25.0 cm3 of sodium hydroxide solution is tritrated against 0.200 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.
Phenolphthalein is used as an indicator in the above experiment. What will be its colour change at the end point?
From red to yellow
From red to colourless
From yellow to colourless
From yellow to red
25.0 cm3 of sodium hydroxide solution is tritrated with 0.200 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.
What is the molarity of the sodium hydroxide solution?
0.100 mol dm-3
0.110 mol dm-3
0.200 mol dm-3
0.220 mol dm-3
In an experiment to determine the concentration of H2SO4 in a brand of toilet cleanser, 10.0 cm3 of the cleanser was first diluted to 250.0 cm3 with distilled water. 25.0 cm3 of the diluted cleanser were titrated with 0.320 mol dm–3 NaOH solution, using methyl orange as indicator.
What is the colour change of the indicator at the end point of the titration?
From colourless to pink
From pink to colourless
From yellow to red
From red to yellow
In an experiment to determine the concentration of H2SO4 in a brand of toilet cleanser, 10.0 cm3 of the cleanser was first diluted to 250.0 cm3 with distilled water. 25.0 cm3 of the diluted cleanser were titrated with 0.320 mol dm–3 NaOH solution, using methyl orange as indicator.
If 29.2 cm3 of NaOH solution is used, what is the concentration of H2SO4 in the undiluted toilet cleanser?
2.30 mol dm–3
4.60 mol dm–3
9.20 mol dm–3
11.50 mol dm–3
In an experiment, 30.0 cm3 of a monobasic acid HA(aq) were titrated with 0.100 mol dm–3 NaOH(aq). The following graph shows the variation of pH of the solution mixture during the titration:
What is the concentration of HA(aq)?
7.50 x 10–5 mol dm–3
1.50 x 10–4 mol dm–3
7.50 x 10–2 mol dm–3
1.50 x 10–1 mol dm–3
The table above lists the pH ranges for colour change of three acid-alkali indicators:
Which of the indicators is / are suitable for the titration in question 8?
Bromocresol green only
Phenolphthalein only
Bromocresol green and methyl red only
Methyl red and phenolphthalein only
25.0 cm3 of 0.30 mol dm–3 sodium hydroxide solution require 20.0 cm3 of a 0.125 mol dm–3 acid solution for complete neutralization. What is the basicity of the acid?
1
2
3
4
