RESEARCH QUESTION

How does different type of liquids affect the rate of evaporation of the liquids?

HYPOTHESIS

The stronger the intermolecular force, the slower the rate of evaporation

Hydrochloric acid is the acid with the lowest rate of reaction compared to the other two acids, phosphoric acid and sulphuric acid. This is because HCl is a strong acid. It dissociates easily in water to form hydrogen and chloride ions. Strong acid means that HCl has strong covalent bond. So, it requires a lot of energy to break the bonds between the hydrogen and chloride ions.  

VARIABLES

  1. Manipulated variable: types of solution used ; HCl [0.1 mol) , H₃PO₄ [0.1], H₂SO₄ [0.1]
  2. Responding variable: time taken for the solution to evaporate
  3. Controlled variable:  

        1) volume af the acid

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  • Only a little acid is needed as it have a strong intermolecular forces.

2) surface area of the evaporating dish

  • the surface area used is the same that is in the petri dish.

3) concentration of the acid

  • The concentration used for the acid is the same that is 0.1M

4) temperature

  • the temperature for the water bath is fixed to 60°c

5) air humidity

  • the experiment was carried out in the same place that have the same humidity

MATERIALS AND APPARATUS

Table 1: list of apparatus and material used

METHOD

  1. Prepare the ...

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