Which concentration of acid when reacted with marble pieces gives off the largest volume of gas in the fastest time?

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Which concentration of acid when reacted with marble pieces gives off the largest volume of gas in the fastest time?

Aim

My aim is to find out which concentration of gas when reacted with marble pieces gives off the largest volume gas in the fastest time.

Prediction

I think that the strongest concentration of acid will give off the largest volume of gas, as there will be more reactions quicker.

Apparatus

Hydrochloric acid

Distilled water

Small marble pieces

Gas syringe

Conical flask

Measuring cylinder

Cork

Stop-watch

Safety glasses

Method

. Firstly you need to collect your equipment.

2. You then need to set up your equipment carefully as shown in the diagram.

3. Then you measure 75ml of hydrochloric acid into a measuring cylinder.

4. You then put 10g of small marble pieces in the conical flask

5. Then add the hydrochloric acid, put the cork in and start the stopwatch.

6. Then record the volume of gas every 5 seconds until the reaction stops.

7. You then repeat the experiment five more times but for each time you take 5ml of acid away and replace it with distilled water this is so you keep the mass the same.
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Safety

* Always tie back hair and loose clothing

* Always wear safety glasses especially when using acids.

* Any spillages report to your teacher immediately

* Any breakages report to teacher immediately

Variables

Keeping the same

* The amount and the size of marble will be kept the same.

* The overall mass will be kept the same.

* The type of acid used will be kept the same

* The place of the reaction will be kept the same.

Changing

* I will ...

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