C6 -REQUIRED PRACTICAL COLOUR CHANGE

• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, what is the independent variable?

  Concentration of sodium thiosulfate
• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, what is the dependent variable?

  Time (taken for cross to disappear)
• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, what is the control variable?

  Amount hydrochloric acid
• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, the product sulfur is an insoluble solid so also known as a __________.

  Precipitate
• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, which product causes the cross to disappear?

  Sulfate
• A ____ _____ measures the exact light transferred through the solution which is more accurate

  Light sensor
• When reacting sodium thiosulfate with hydrochloric acid at different temperatures, the lower the time the cross takes to disappear, the _____ rate of reaction.

  Faster
• As the concentration increased, the time taken for the cross to disappear decreased.