Practical

Question 1

Steps for practical

Answer 1

measure (indicated) volume of sodium thiosulfate

place sodium thiosulfate in (conical) flask

⚫ measure (indicated) volume of hydrochloric acid

connect to a gas syringe

other suitable method for timing a change ⚫ add hydrochloric acid to (conical) flask

.swirl swirl

start stopclock / stopwatch

measure time for cross to become no longer visible

repeat for different concentrations of sodium thiosulfate

or change ratio of sodium thiosulfate volume: water volume

control variables

⚫ concentration of hydrochloric acid

volume of hydrochloric acid

(total) volume of sodium thiosulfate solution