Hello today in class we are doing “blind” testing with some litmus paper.
We will have 6 drops of colourless acid or base on a spotting tile.
we will then use some red and blue litmus paper to see if it is: H2O, HCl, NaOH.
The final results of each row were base, acid and base. For the left row it went neutral, neutral and acid. There were 2 each of these solutions because there were 6 slots on our spotting tile. When we dipped red litmus paper on the first slot of the right row, it turned blue, this tells us it’s a base. We dipped blue litmus paper into the one below the first slot, it turned red, so this means it’s an acid. We then used both red and blue litmus for the last solution of the row and both the litmus paper stayed their colour, this clearly means it’s neutral. For the row on the left we both dipped red and blue litmus paper on 2 of the first slots, they both stayed red and blue so this means both of them are neutral. Lastly we dipped blue litmus paper into the last solution and it turned red. So it’s an acid.


