TEST OF PRACTICAL KNOWLEDGE QUESTION (a) In the laboratory preparation of crystals of CuSO\(_4\), a green powder Q was added to dilute H\(_2\)SO\(_4\), and ...

TEST OF PRACTICAL KNOWLEDGE QUESTION

(a) In the laboratory preparation of crystals of CuSO\(_4\), a green powder Q was added to dilute H\(_2\)SO\(_4\), and stirred. Effervescence occurred and a gas R was given off which turned lime water milky. Excess Q was removed from the mixture. The solution of Cu\(_2\)SO\(_4\) was concentrated to half its original volume and allowed to stand.

(i) What is substance Q?

(ii) Name gas R

(ii) Why was excess Q used?

(iv) How would you know that the reaction is complete?

(v) What method was used to remove excess Q? (vi) Why was the solution of CusO\(_4\) not heated to dryness?

(b) Name the reagent(s) used for testing each of the following substances in the laboratory: (i) Water; (i) Primary alkanol.