rate of reaction

Question 1

describe an investigation to show how the concentration of sodium thiosulfate solution affects the rate of reaction with dilute hydrochloric acid

Answer 1

• use a measuring cylinder to add 10cm3 of sodium thiosulfate into a conical flask
• place conical flask onto a printed black cross
• add 10cm3 of dilute hydrochloric acid into the conical flask
• swirl the solution and start a stopwatch
• when you look down through the top of the flask you will see the solution has turned cloudy. stop the clock when you can no longer see the cross
• repeat experiment using different concentrations of sodium thiosulfate solution
• repeat whole experiment and calculate mean values for each concentration of sodium thiosulfate solution