1 The list gives some substances that can be used to test liquids.
A anhydrous cobalt chloride
B anhydrous copper sulfate
C thymolphthalein
D methyl orange
E universal indicator
Use the letters A, B, C, D or E to answer the following questions.
Each substance may be used once, more than once or not at all.
a Which substance will turn yellow in alkali?
b Which substance will turn pink in pure water?
c Which substance will remain colourless in acid?