3. The rate of reaction of dilute hydrochloric acid with sodium thiosulphate solution to give a yellow ppt of sulphur , was studied by timing how long it took for a black spot to disappear when viewed through the solution. In each case, the volume of the solution was 50cm and the flask was used. The times was as follows: A. 10sec B. 150 sec C. 300sec D. 222 Sec E. 75 Sec
(i) Which time represents the lowest concentration of sodium thiosulphate used? Sec
(ii) Which time represents the highest rate of reaction? Sec
(iii) Which time represents a rate approximately twice as fast as the rate represented by time B? Sec