Cambridge Secondary (7-9). Stage 7. MCE Science. Student Book - Unit 8: Acids and Alkalis - Question 68

Tendai tests an unknown liquid by putting one drop of the liquid onto a piece of red and blue litmus paper. The red litmus paper is unchanged and the blue litmus paper turns red.

Tendai carefully drips the liquid into a beaker of sodium hydroxide solution.

Complete the word equation to show the general types of reactants and products in this reaction.

alkali + _____ → _____ + _____