What is a neutralization reaction?
Classify the following substances as acids or bases.
i)
unripe lemon juice;
ii)
wood ash;
iii)
liquid in a car battery;
iv)
bicarbonate of soda.
(i)
What is neutralization reaction?
(ii)
Write a balanced chemical equation for the reaction between each of the following pairs of substances:
(α)
Sodium metal and dilute hydrochloric acid
(β)
Sodium hydroxide and dilute hydrochloric acid
An amount of sodium hydroxide solution was put into a beaker and a piece of litmus paper was added. Dilute hydrochloric acid was added a little at a time with stirring until the litmus paper just turned purple. The resulting solution was evaporated to dryness.
i)
What was the colour of the litmus paper in the sodium hydroxide solution?
ii)
What does the colour change of the litmus paper indicate?
iii)
What substance was left after the evaporation?
iv)
Write a balanced equation for the reaction that took place.
What observation will be made if a piece of blue litmus paper is dropped in each of the following:
(i)
sodium hydroxide solution
(ii)
dilute hydrochloric acid
(iii)
lime juice
(iv)
distilled water
(v)
rain water
Sodium chloride is prepared by the reaction between dilute hydrochloric acid and sodium hydroxide solution. Write down the equation for this reaction.
What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solutions?
(i)
Sodium hydroxide solution;
(ii)
Dilute hydrochloric acid;
(iii)
Lime juice;
(iv)
Water.
A student who went to bed immediately after eating complained of stomach upset the next morning. A doctor prescribed a liver salt, whose major composition is NaHCO3 as the medication.
Using a balanced chemical equation, explain how the liver salt would relieve the student from this discomfort.
i)
What is an acid?
ii)
Give two difference between an acid and a base, in terms of taste and feel.
State the colour change that would occur when blue litmus paper is dipped onto a solution of:
i)
α)
vinegar;
β)
wood ash.
ii)
Name the products formed when hydrochloric acid reacts with sodium hydroxide.
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