Andrew's answer to swxtz's Secondary 3 Chemistry Singapore question.

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Andrew
Andrew's answer
11 answers (Tutor Details)
1st
swxtz
Swxtz
1 year ago
which one is ans for a) and b)?
Andrew
Andrew
1 year ago
The above is for A

For B, my apology I miss out, here's the answer.
Prepare three test tube in a test tube rack, add metal of each sample to test tube respectatively. Add sodium hydroxide solution to each of the test tube.

Solutions containing copper(II) ions will form a blue precipitate with sodium hydroxide. With the colour, we will know each contain copper(ii) ion.
swxtz
Swxtz
1 year ago
oh okay thank you :)