What is produced if an acid is added to a base?

27 What is a neutralization reaction? Explain with an example. Give the chemical equation of the reaction which takes place. 28 Why should curd and other sour foodstuffs (like lemon juice, etc) not be kept in metal containers (such as copper and brass vessels)? 29 Why does dry HCI gas not change the colour of dry litmus paper? 29 What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?