D is a mixture of a soluble lead salt and an insoluble white powder. The mixture was added to 15 cm3 of distilled water, stirred and filtered.
The tests indicated in the table below were carried out on the filtrate and the residue.
Copy and complete the table as appropriate.
Do not complete the inference column in 2(a)(i) and 2 (a)(ii).
Test |
P |
Q |
R |
Portion of filtrate + NaOH(aq) in drops ;then in excess |
|
|
8.0 - 9.6 |
Portion of filtrate + NH3(aq) in drops, then in excess |
|
|
|
Portion of the filtrate+FeSO2(aq) NOpresent + Conc. H2SO4 |
|
NO-3present |
|
Residue + dil.HNO3 |
|
CO2-3present |
|
Portion of solution from White precipitate
(b)(i) + NaOH(aq) in insoluble in excess drops, then in excess |
White precipitate (b)(i) + NaOH(aq) in insoluble in excess |
|
|
Portion of solution from (b)(i) + NH3(aq) in drops, then in excess |
|
|
|
Select the indicator(s) that would be suitable for titrating:
(i) strong acid with strong base;
(ii) strong acid with weak base;
(iii) weak acid with strong base.