Copy and complete the table.
|
Test |
Observation |
Inference |
(a) |
D + distilled water |
Did not dissolve |
…………………….. |
(b) |
D + dil. HCI + heat |
Dissolved to form blue or greenish-blue solution |
……………………. |
(c) |
Solution of D
+ NaOH(aq) in drops then in excess |
Blue gelatinous precipitate
………………………… |
…………………….. |
(d) |
Solution of D
+ NH3(aq) in drops then in excess |
…………………………..
…………………………… |
Cu2+ present
Cu2+ confirmed |
(e) |
(i) E(aq) + NaOH(aq) in drops and in excess |
No precipitate |
…………………. |
(ii)Mixture in 2(e)(i) warmed |
……………………………
…………………………..
………………………….. |
NH3 gas evolved, therefore NH4+ present |
(f) |
E(aq) +BaCl2(aq) |
White chalky precipitate. No gas evolved, precipitate did not dissolve |
…………………….
…………………….
…………………… |
In a titration experiment, 22.50 cm3 of an acid solution A containing 10.6 g of NaHSO4 per dm3 reacted with 25.0 cm3 of solution B containing X g of NaOH per dm3.
The equation for the reaction is:
NaHSO4(aq) + NaOH(aq) Na2SO4(aq) + H2(l)
(a) From the information given above, calculate the:
(i) concentrate of A in moldm– 3;
(ii) concentrate of B in moldm– 3;
(iii) value of X;
(iv) mass of Na2SO4 formed during the reaction.
[ H = 1.00; 0 = 16.0; Na = 23.0; S = 32.0] (16 marks)
(b)
(i) Name a suitable indicator for the titration
experiment.
(ii) State the apparatus used to measure the
volume of solution:
I. A;
II B; (3 marks)