Today I have done a experiment with my mother about chemistry.
1º.- Place the ph paper on the circles on the sheet. Then, test the listed products by putting a drop of each on the ph paper using the dropper.
2º.- Compare the colour the color of the mark on the ph paper with the ph scale.
The more acid the liquid is the redder the marks it leaves. Vinegar has a ph of 2; it is very acid. So are lemon juice and fanta, which I also tasted. Water leaves a green trace, it has a ph of 7, which is a neutral ph , as does washing-up liquid.