Required practicals

Question 1

Describe how to carry out a practical investigation to explore the effect of concentration on the rate of a reaction.

Answer 1

1. Use a measuring cylinder put 10cm3 of sodium thiosulfate soultion into a concical flask.
2. Place the conical flask onto a printed black cross.
3. Next add 10cm3 of hydrochloric acid into the conical flask.
4. Swirl the solution and start a stopwatch.
5. Stop the clock when we can no longer see the cross.
6. Repeat using lower concetrations of sodium thiosulfate solution.

Question 2

Describe another way of how to carry out a practical investigation to explore the effect of concentration on the rate of a reaction.

Answer 2

1. Use a measuring cylinder to place 50cm3 of hydrochloric acid into a conical flask.
2. Attach the conical flask to a bung and delivery tube.
3. Now place the delivery tube into a container filler with water.
4. Then place an upturned measuring cylinder also filled with water out the delivery tube.
5. Add a 3 cm strip of magnesium to the HCL and start a stopwatch.
6. Hydrogen gas is produced which is trapped in the measuring cylinder, every 10 secs, measure the volume of H gas.
7. Repeat using different conc of HCL.

Question 3

Whis meant if a measurement is reproducible?

Answer 3

If it can be repeated by another person or using a different technique or equipment and still get the same result.