A-LevelChemistryGroup 29701/12 · Feb/Mar 2024 · Q221 Mark
The diagram shows the process of adding calcium nitrate and strontium nitrate to separate boiling tubes and heating them. Identical conditions are used. [Figure showing two boiling tubes being heated, one with Ca(NO3)2 and universal indicator, the other with Sr(NO3)2 and universal indicator] As the reactions proceed, the water containing universal indicator changes colour. Which row describes the colour change and identifies the nitrate that causes the quickest colour change?
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Acolour change of universal indicator: green to blue, nitrate that causes the quickest colour change: Ca(NO₃)₂
Bcolour change of universal indicator: green to blue, nitrate that causes the quickest colour change: Sr(NO₃)₂
Ccolour change of universal indicator: green to red, nitrate that causes the quickest colour change: Ca(NO₃)₂
Dcolour change of universal indicator: green to red, nitrate that causes the quickest colour change: Sr(NO₃)₂
✓ Correct answer
C: colour change of universal indicator: green to red, nitrate that causes the quickest colour change: Ca(NO₃)₂
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