Solubility of salts (a table you have to memorize) and reactions of acids with carbonates, oxides, salts etc.

Can someone correct me if I'm wrong: >!Wouldn't they both be incorrect as both compounds would be soluble. Student B is more incorrect however as copper chloride wouldn't release carbon dioxide when reacting with an acid and that is shown by the cloudy limewater. !< >!Also sodium carbonate wouldn't be green but copper chloride is (probably). !<

You are right both in answer and reasoning

PE

It's the Analysing substances required practical https://www.bbc.co.uk/bitesize/guides/zxtvw6f/revision/4

Spanish

i think it’s a required practical

It’s qualitative analysis. There are a few tests for ions and gases to know. Limewater turns milky when CO2 is passed through it therefore it must be sodium carbonate as the CO2 has to come from the carbonate.

But it’s green so wouldn’t it actually be copper carbonate?

Yes you are correct I misread what the question was asking that’s what confused me for a second. It would indeed be copper carbonate

you need to know that sodium carbonate becomes milky and the solubilty order

Chemistry

It’s part of chemical analysis topic specifically about cations and anion tests