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# Crumbling CastlesWhat is the Effect of Nitric Acid on Limestone?

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Introduction

Crumbling Castles What is the Effect of Nitric Acid on Limestone? Variables o Concentration of Acid o Volume of Acid used o Mass of limestone used o Temperature of room o Temperature of Acid Basic Plan We are going to measure the amount of gas produced in the reaction of nitric acid and calcium carbonate (limestone). We are going to put different concentrations of nitric acid and record how much gas is produced using a gas syringe. We will keep the mass of the limestone and volume of the acid used the same. We will do this to keep the experiment a fair test. We will take into account the changes in temperature because we cannot control it very easily. ...read more.

Middle

o Put the gas syringe on the conical flask immediately. o Leave for 3 minutes. o Take out syringe and record the volume of gas produced. o Repeat test at least 3 times. o Repeat the test with 20cm2 of, for example, 0.8m, 0.6m, 0.4m, 0.2m and 0.0m, nitric acid. o To make 20cm2 of 0.6m nitric acid, for example, put 12cm2 of 1m nitric acid in a measuring cylinder with a pipette and 8cm2 of water. o Record the volumes of gas produced. o Lay out all results in a table. Prediction I predict that the stronger the acid with the limestone the more gas will be produced because if there is more acid molecules in the solution there will be more "stuff" there for the limestone to react with. ...read more.

Conclusion

There is sudden drop from 0.8-0.6 molar acids and all of "Trial 3" is a lot higher than the others, this could have happened because the concentration of the acid was greater. Evaluation All the results of "Trial 3" were higher than I had expected. This may have happened because the concentration of acid wasn't correct and was too strong or the temperature of the room might have been hotter. I think the results are reliable because I took them 3 times and trials 1 + 2 are roughly the same. To improve the experiment I would do it all on the same day because the temperature of the room may have altered on the different days. This would affect the experiment because the hotter the solution is the more reacting there would be. ?? ?? ?? ?? Tom Nicholls 11S ...read more.

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