an unknown substance turns blue litmus paper to red. which additional test could be used to confirm the…

an unknown substance turns blue litmus paper to red. which additional test could be used to confirm the substances identity? it should turn phenolphthalein from colorless to pink because it is a base. it should turn phenolphthalein from pink to colorless because it is a base. it should turn methyl orange to orange because it is an acid. it should turn methyl orange to red because it is an acid.

an unknown substance turns blue litmus paper to red. which additional test could be used to confirm the substances identity? it should turn phenolphthalein from colorless to pink because it is a base. it should turn phenolphthalein from pink to colorless because it is a base. it should turn methyl orange to orange because it is an acid. it should turn methyl orange to red because it is an acid.

Answer

Answer:

D. It should turn methyl orange to red because it is an acid.

Explanation:

Step1: Analyze litmus - paper result

Blue litmus paper turning red indicates an acid.

Step2: Recall indicator properties

Methyl orange turns red in acidic solutions. Phenolphthalein is color - less in acids and pink in bases. So the correct test for an acid (after blue litmus turning red) is that methyl orange should turn red.