A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
A weak base turns the pH paper greenish-blue. Antacids usually contain weak base such as Mg(OH) 2. So, an antacid would change the colour of this pH paper to greenish- blue. Other options such as lemon juice and vinegar contain acids and common salt is a neutral salt.
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