The document describes an experiment to measure the rate of reaction between marble chips and hydrochloric acid solutions of different concentrations. Mass measurements were taken over time as the marble reacted with 2.0 M and 1.0 M HCl solutions. The rate of reaction was determined by measuring the loss of mass of the marble samples. A graph comparing the mass loss over time for the two acid concentrations showed that the 2.0 M HCl solution reacted faster than the 1.0 M solution.

1. weight on pan Rate of reaction means the speed of the reaction.
Time balance loss of mass This can be either:
0 50 (a)The rate of disappearance of reactants
1 49.93 0.07 (b)The rate of appearance of products
2
3 The rate of reaction between marble chips and dilute
4 hydroochloric acid can be tracked by measuring the
5 weight loss as the reaction proceeds.
7
9 Method:
11 (1)put beaker on the digital pan balance and press
the zero button.
13
(2)Add about 2g of calcium carbonate.
(3)Add 50 mL of 2.0 moles per liter hydrochloric acid
(4)start stopwatch running and note the weight
recorded on the balance
(5)record your results on the table
Copy this table into your book and take the weight
measurements from the video.

2. weight on pan Rate of reaction means the speed of the reaction.
Time balance loss of mass This can be either:
0 50 (a)The rate of disappearance of reactants
1 49.93 0.07 (b)The rate of appearance of products
2 49.86 0.14
3 49.7 0.3 The rate of reaction between marble chips and dilute
4 49.59 0.41 hydroochloric acid can be tracked by measuring the
5 49.46 0.54 weight loss as the reaction proceeds.
7 49.38 0.62
9 49.25 0.75 Method:
11 49.19 0.81 (1)put beaker on the digital pan balance and press
13 49.15 0.85 the zero button.
(2)Add about 2g of calcium carbonate.
(3)Add 50 mL of 2.0 moles per liter hydrochloric acid
(4)start stopwatch running and note the weight
recorded on the balance
(5)record your results on the table
Copy this table into your book and take the weight
measurements from the video.
rate of reaction:2.0 mole per liter hydrochloric acid and marble chips
0.9
0.8
0.7
0.6
mass loss
0.5
Column D
0.4
0.3
0.2
0.1
0
0 2 4 6 8 10 12 14
time (min)

3. 2.0 mole per liter hydrochloric acid 1.0 mole per liter hydrochloric acid
weight on pan Weight on pan
Time balance (1) loss of mass (1) balance (2) loss of mass (2)
0 51.7 51.14
1 51.6 0.1 51.1 0.4
2 51.45 0.25 51.01 0.13
3 51.33 0.37 50.91 0.23
4 51.21 0.49 50.83 0.31
5 51.13 0.57 50.79 0.35
6 51.05 0.65 50.74 0.4
7 50.99 0.71 50.69 0.45
8 50.94 0.76 50.65 0.49
9 50.89 0.81 50.62 0.52
10 50.86 0.84 50.58 0.56
11 50.84 0.86 50.54 0.6
12 50.8 0.9 50.53 0.61
plot the results for these experiments on graph paper

4. comparing rate of reaction with 2.0 and 1.0 mole per liter acid
1
0.9
0.8
0.7
loss of mass (g)
0.6
0.5 loss of mass (1)
loss of mass (2)
0.4
0.3
0.2
0.1
0
0 2 4 6 8 10 12 14
time (min)