An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?
A
It should turn phenolphthalein from colorless to pink because it is a base.B
It should turn phenolphthalein from pink to colorless because it is a base.C
It should turn methyl orange to orange because it is an acid.D
It should turn methyl orange to red because it is an acid.