Answered

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Q2.
A student uses this apparatus to find the temperature change when sodium hydroxide solution
reacts with dilute hydrochloric acid.
polystyrene cup
1
This is the student's method.
• pour 20 cm of sodium hydroxide solution into a polystyrene cup
• record the temperature of the sodium hydroxide solution
• add 20 cm of dilute hydrochloric acid and stir the mixture
• record the highest temperature of the mixture
(a) () Give the formula of the ion that causes sodium hydroxide solution to be alkaline.
(1)
(1) Give the formula of the ion that causes hydrochloric acid to be acidic.
(1)
(1) Write the net ionic equation for neutralization reaction of sodium hydroxide with
hydrochloric acid
(1)
(iv) Suggest a pH value for the dilute hydrochloric acid.
(1)
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