rates of reaction Flashcards
1
Q
PRACTICAL - explore effect of concentration on rate of reaction using a cross
A
- Add 10cm³ of sodium thiosulfate solution in a conical flask
- place the conical flask onto a drawn black cross
- then add 10cm³ hydrochloric acid into the conical flask
- swirl the solution and start a stopwatch
- solution will start to become cloudy
- stop the stopwatch when you can no longer see the cross
- repeat using lower concentrations of sodium thiosulfate solutions
2
Q
PRACTICAL -measuring volume of a gas produced by a reaction
A
- add 50cm³ of hydrochloric acid into a conical flask
- attach conical flask to bung and delivery tube
- place delivery into container filled with water
- place an upturned measuring cylinder also filled with water over the delivery tube
- add one magnesium ribbon to the hydrochloric acid and start a stopwatch
- hydrogen gas will be produced and be trapped in the measuring cylinder
- measure volume of hydrogen gas in cylinder every 10s
- continue until no more hydrogen is given off
- repeat using different concentrations of hydrochloric acid
