Answers section

Questions 3.5a

1. 1. What is the colour of phenolphthalein in sodium hydroxide solution? ------
   2. What does this confirm about sodium hydroxide? -----------------
2. 1. What is the final colour of phenolphthalein in the reacting mixture? --------
   2. What does this show about the change in pH? -------------------------
3. One of the products of this reaction is water. Name the other product.
4. What would be observed on the watch glass if the water in the product is evaporated to dryness? Hint: Check the pictures of Common Chemistry Laboratory Chemicals, under sodium and its compounds.
5. Write a word equation for the reaction between sodium hydroxide and sulphuric acid solutions. ------------------
6. From the final colour of phenolphthalein, what would you call this reaction?--- Hint: The products, which include water, are is neither acidic nor basic.