Test the affect of concentration of sodium Thiosulphate on the rate it’s of reaction with hydrochloric acid.

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How does the concentration of Thiosulphate affect the rate of reaction with Hydrochloric acid

Background Information

Rates of Reaction;

The rate of reaction is the rate at which two substances react with each other. These are the variables affecting rates of reaction-

  • The concentration of the reactants, the more concentrated the shorter the time it takes to react, as there are more particles to react.
  • The surface area of the reactants, the larger the surface area the shorter the time it takes to react as there are more particles that the other reactants have contact with. Only the particles on the surface can react, if more are exposed more can react in the same period of time.

  • In a gas reaction if you increase the pressure the rate of reaction is increased because there are more particles to the same volume.
  • The higher the temperature of the reactants the shorter the time taken to react because particles gain more energy and move around more (see collision theory) and therefore collide more often with other particles.
  • Catalysts- a catalyst increases the rate of reaction.

Collision theory;

 All these variables affects on rates of reaction are true because of collision theory. Substances can only react when their particles collide, the faster they move or the more of them there are increases the number of collisions and increases the number of reactions in a certain time, reducing the reaction time.

Low-pressure gas reaction

Gas A (10)

Gas B (10)

High-pressure gas reaction

        Gas A (10)

        Gas B (10)

There is the same amount of gas in each reaction, but in the high-pressure reaction they are all within a quarter of the space of the low-pressure reaction. There is a much higher chance of collision in the high-pressure reaction because the particles are all closer together; this makes the rate of reaction faster.

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Test

Aim;

To test the affect of concentration of sodium Thiosulphate on the rate it’s of reaction with hydrochloric acid.

Variables;

Variables to change-

  • The concentration of Thiosulphate

Variables to keep the same-

  • Concentration of hydrochloric acid
  • Volume of sodium Thiosulphate
  • Volume of hydrochloric acid
  • Temperature
  • No catalysts

Accuracy;

Things to control to get accurate results-

  • Same person timing
  • Same person measuring reactants
  • Same measuring cylinder
  • Same stop watch
  • Same cross on paper (see method)
  • Repeat results and take an average
  • Make sure lowest point on meniscus lines up with measuring mark
...

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