PH-Value Testing during Chemistry Lesson of Grade 9

We have all read the terms "pH balanced" or "pH neutral" on shampoos of skin lotions, but what do they exactly mean? During an exciting chemistry session, the students of Grade 9 learned today what measurement we use to decide whether something is an acid or a base, what pH actually stands for, and how we can measure the pH value of a substance. The students then used different materials we all have in our houses like cleaners, soaps, sugar, baking soda, etc., and tested them with different indicators on their pH-values.

159862332 4096908887008728 6942749800665552066 o

159623981 4096908990342051 8607588250998541935 o

160320991 4096908917008725 3542463934733329776 o

160505471 4096909027008714 8501467887376333751 o

161196874 4096908670342083 3713487870795914318 n

161360091 4096908817008735 2463095564909408547 o

162198591 4096908697008747 1044034983221995725 o

162693215 4096909010342049 6495425932003069495 o