Weakness and Remedies

Candidates could not:                                                                                                                        
Calculate the concentration of HCl in P, in mol dm-3;
Calculate the amount of HCl in 6.15 dm3 o P;
Write correct charges on cations and anions.

The following remedies were however suggested:

Candidates should:

Understand the demands of the questions before responding to them;
Be familiar with the charges on anions and cations;
Learn how to write correct inferences from reaction observations.