Aim: To observe a neutralization reaction.
equipment: A test tube, test tube rack, hydrochloric acid, sodium hydroxide, dropper or dropper bottle and universal indicator.
Method:
1. fill 4 test tubes with 3ml of acid
2. fill 2 test tubes with 3ml of base
3. add a squirt of universal indicator to each test tube
4. add different amounts of base and acid to each test tube to get the colours of the rainbow (ROYGBIV)
Results:
Emily and I worked together in making the rainbow of colours using the acids and base we were given.
Discussion:
The colours in the test tube shown are telling us how neutral, basic and acidic the solution is. The redder the solution is the more acidic it is and the bluer it is the more basic it is. just to the right of the centre, the test tube is green and that tells us that the solution in the centre is in theory neutral. The process of neutralisation goes as follows. The acid (HCl) mixes with the base (NaOH) making water. the chemical reaction looks like this. HCl + NaOH → water. this reaction makes the solution more neutral the more balanced the ratio to acid and base there is.
Conclusion.
In conclusion, the test tube filled with acid showed the colours of the rainbow using the PH scale. it worked very well.