Indicators are used to determine whether a solution is acidic or alkaline. Acids react with metals, bases and carbonates to produce salts. Neutralisation is the reaction between an acid and a base.
Which of the following solutions could have a pH of 12?
How do the concentrations of ions in an alkaline solution compare to pure water?
The alkali contains more hydroxide ions (OH-)
The alkali contains more hydrogen ions (H+)
The alkali and pure water contain the same concentration of hydrogen ions (H+) and hydroxide ions (OH-)
How does diluting an acid with water affect its pH?
The pH decreases towards 7
The pH increases towards 7
It has no effect on the pH
What colour change could occur when hydrochloric acid is added to an alkaline solution containing universal indicator?
Red to green
Green to purple
Purple to red
What is the general equation for the reaction of a metal with an acid?
Metal + acid → salt + hydrogen
Metal + acid → salt + water
Metal + acid → salt + alkali
What is the name of the salt produced when potassium hydroxide reacts with sulfuric acid?
What products are formed when hydrochloric acid reacts with copper carbonate?
Copper chloride and hydrogen
Copper chloride, water and carbon dioxide
Copper chloride and water
What happens to the pH of a solution of hydrochloric acid as calcium oxide is added?
It stays the same
A small amount of hydrochloric acid is dissolved in a large volume of water. What is the best description of this solution? - Higher
A dilute solution of a weak acid
A weak solution of a strong acid
A dilute solution of a strong acid
Natural rainwater has a pH of 5. The most acidic rain ever recorded in Britain was 1000 times more acidic than natural rainwater. What was its pH? - Higher