Rates Of Reaction

Question 1

Describe the practical for the disappearing cross?

Answer 1

1. Use a measuring cylinder to put 10cm^3 of sodium this sulfate solution into a conical flask
2. Place the conical flask onto a printed white cross
3. Add 10cm ^3 of hydrochloric acid into the conical flask
4. Swirl the solution and start the stopwatch
5. Look down at the conical flask
6. After a certain amount of time the solution will begin to turn cloudy & then stop the stop watch when you can no longer see the cross
7. Carry out the experiment again suing a lower concentration of sodium this sulfate solution
8. Repeat the experiment & calculate mean values for each conc

Question 2

What is a negative of the disappearing cross experiment?

Answer 2

Ppl have different eyesights meaning some ppl can see the cross for longer

Question 3

Describe the gas collecting experiment?

Answer 3

1. Use a measuring cylinder to place 50cm ^3 of hydrochloric acid into a conical flask
2. Attach a bing and delivery tube
3. Now place the delivery tube into a container filled with water
4. Then place an upturned measuring cylinder also filled with water over the delivery tube
5. Add 3cm strip of magnesium ti hydrochloric acid and start the stopwatch
6. Reaction produces hydrogen gas which gets trapped in the measuring cylinder
7. Measure the volume of gas every 10 seconds until no more is given off
8. Repeat the experiment using a different conc of hydraulic acid