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  • Level: GCSE
  • Subject: Science
  • Document length: 839 words

CalciumCarbonate + Hydrochloric Acid —> Calcium Chloride + Water + Carbon Dioxide CaCO3 +2HCl —> CaCl 2 + H2O + CO2 Aim Method & Diagram

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Introduction

Calcium Carbonate + Hydrochloric Acid -> Calcium Chloride + Water + Carbon Dioxide CaCO3 + 2HCl -> CaCl 2 + H2O + CO2 Aim Investigate factors affecting rate of reaction between calcium carbonate and hydrochloric acid. Method & Diagram Fill measuring cylinder with water Half fill water basin with water Invert measuring cylinder whilst covering open end with hand Submerge measuring cylinder (End with hand on) Put 25ml of acid into the conicle flask Have 2.0g of marble chips ready Put end of pipe into submerged conicle flask Prepare to start stopwatch Put marble chips in with acid & put bung on conicle flask whilst starting stopwatch Every 30s starting from 0s take a measurement of how much air there is in measuring cylinder (cm3) When you have done this with the first concentration of acid clean out the conicle flask and refill the measuring cylinder & repeat experiment with next concentration of acid.

Middle

Safety * Use goggle eye protection * Rinse acid contacted area with water & seek help Results Experiment 1 0.25M 0.5M 1.0M 1.5M 2.0M 0 0 0 0 0 0 30 2 4 10 20 30 60 4 6 24 50 64 90 8 8 42 80 114 120 10 14 60 106 146 150 12 16 75 130 178 180 13 18 90 152 204 210 15 30 115 174 222 240 16 42 130 194 244 270 18 52 142 210 265 300 20 58 172 224 277 Experiment 2 0.25M 0.5M 1.0M 1.5M 2.0M 0 0 0 0 0 0 30 3 4 10 15 33 60 5 7 22 40 67 90 7 14 34 75 116 120 9 18 54 100 145 150 11 25 75 125 179 180 12 30 90 144 205 210 14 39 100 160 225 240 16 45 115 180 242 270 17 55 128 196 269 300 20 64 141

Conclusion

2.0M acid was so fast compared to 0.5M acid because in 2.0M acid there is a higher concentration of particles of acid so there is more chance of a collision between acid particles and calcium carbonate particles. In 0.5M acid it was so slow because there is a quater of the amount of acid particles in 2.0M acid. I can draw a labelled diagram which shows particles of acid colliding with marble chips and making gas and I can use this to explain what I found out in my results. Evaluation I cannot think of a better way of doing the experiment or collecting more accurate results except than using more detailed measuring cylinder's. I do think that taking averages helps because it gives an average result which means that it can be more accurate than lots of individual results. The main difficulties in doing this experiment I think were taking results accurately.

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