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Investigation of the reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Naveen Chauhan. 10Sc2:- Investigation of the reaction between Sodium Thiosulphate and Hydrochloric Acid. Aim:- We are going to investigate the reaction between Sodium Thiosulphate and Hydrochloric Acid. We are also going to investigate the rate of reaction and what changes affect this as well as the reaction itself. Scientific Knowledge:- There is a theory that states that certain factors, properties and states of the different chemicals used in the reaction affect the rate of reaction, which is in effect, how fast or slow the reaction occurs. These factors are: 1. Surface area of the two chemicals 2. The concentration of the chemicals 3. Stirring the contents of the conical flask while the reaction is taking place 4. The temperature of the chemicals involved in the reaction This theory is called the collision theory, because as it goes, if there is a significant difference between the chemicals, whether it be more or less, the faster the reaction is said to take place. This is due to the particles that make up the two separate chemicals being made to move that extra bit faster than normal, as one or more of these factors is applicable. ...read more.

Middle

Sodium Thiosulphate (c) Sheet of paper Pencil Results:- Number of times stirred every __ seconds Attempt No. 0 10 7 5 2 Continuously Attempt No. 1 (mins) 3:21 3:05 2:57 2:27 2:57 4:57 Attempt No. 2 3:24 3:06 2:55 2:32 2:54 4:59 Naveen Chauhan. 10Sc2:- Page 3 Graph:- Naveen Chauhan. 10Sc2 Page 4 Safety:- For safety in the laboratory we took the following precautions and measures: a) Goggles were used throughout the practical, and we made sure they were always worn when each investigation was carried out to ensure we were following laboratory safety rules and regulations. b) We were also careful when measuring out the chemicals. This was especially important as any spilled matter in a laboratory is not safe and is a safety hazard. c) If by any chance there was any matter spilled, we were careful to clean up the mess so as not to present a hazard. Those were the specific safety measures we undertook during this practical investigation. Fair Test:- To ensure that this investigation we carried out was fair, we carried out the practical bearing in mind certain measures and factors, that could make the whole practical void and strip it of any equity it had. ...read more.

Conclusion

My prediction however was wrong and the chemicals reacted fastest when these stirring conditions applied, that is stirring every few seconds. This is because the more you stir it the more you disturb the chemicals and prevent them from reacting. So when the lower stirring conditions applied thsat is when the reaction was the fastest. Evaluation:- In the end practical was fair and equal for all tests that we carried out and we worked well as well as more importantly safely. Not only regarding our own safety but also of the safety of those around us, working at the same time. This also helped us to achieve accurate as well as reliable results for our practical investigation. We did not get on to the other factors such as: 1. Surface area of the two chemicals 2. The concentration of the chemicals 3. The temperature of the chemicals involved in the reaction My prediction turned out to be wrong as the chemicals reacted much faster when they were stirred after a little while rather than continuously. Our experiment was fair for the reasons stated before. It was also safe for the reasons given in the 'Safety' section. ...read more.

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