Which compounds are soluble?

This task is about compunds that are "soluble".
Soluble is being able to dissolve with another substance such as water. Insoluble is not being able to dissolve with another substance. To test which compounds were soluble in water Robyn took a pinch of each and tried to dissolve it. Her results are in the table below.
indicates the compound was soluble           x  indicates the compound was insoluble
sodium carbonate     sodium sulphate     sodium hydroxide     sodium nitrate    
copper carbonate    x copper sulphate     copper hydroxide    x copper nitrate    
calcium carbonate    x calcium sulphate    x calcium hydroxide    x calcium nitrate    
potassium carbonate     potassium sulphate     potassium hydroxide     potassium nitrate    
 
Use the table to determine whether each of the following statements are true or false, and name all the compounds which support your answer.

Question 2Change answer

a)  i)   All sodium compounds are soluble. TrueFalse
ii)  Name all the sodium compounds that support your answer.

Question 2Change answer

b)  i)  Most sulphate compounds are soluble.  TrueFalse
     ii) Name all the sulphate compounds that support your answer.

Question 2Change answer

c)  i)  All copper compounds are insoluble.  TrueFalse
    ii)  Name all the copper compounds that support your answer.

Question 2Change answer

d)   i)  All nitrates and potassium compounds are soluble.  TrueFalse
     ii)
Name all the nitrate compounds that support your answer.
Name all the potassium compounds that support your answer.