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It turns from blue to white because sulphuric (VI) acid removes water of crystallization from hydrated copper (II) sulphate
johnmulu answered the question on February 6, 2017 at 05:55
- State what would be observed when dilute hydrochloric acid is added to the products formed when a mixture of iron filling and sulphur is heated (Solved)
State what would be observed when dilute hydrochloric acid is added to the products formed when a mixture of iron filling and sulphur is heated.
Date posted: February 6, 2017. Answers (1)
- On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed(Solved)
On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed. When excess aqueous ammonia was added to solution S, a deep blue solution was formed.
a) Identify the cation in solid K
b) Identify the two anions in solution S
Date posted: February 6, 2017. Answers (1)
- Describe how formation of nitrogen (II) oxide in the internal combustion engine leads to gaseous pollution(Solved)
Describe how formation of nitrogen (II) oxide in the internal combustion engine leads to gaseous pollution.
Date posted: February 6, 2017. Answers (1)
- Give a reason why nitrogen (II) oxide is not formed at room temperature(Solved)
Give a reason why nitrogen (II) oxide is not formed at room temperature.
Date posted: February 6, 2017. Answers (1)
- Describe the process by which Nitrogen is obtained from air on a large scale(Solved)
Describe the process by which Nitrogen is obtained from air on a large scale.
Date posted: February 6, 2017. Answers (1)
- Name one raw material from which sodium hydroxide is manufactured(Solved)
Name one raw material from which sodium hydroxide is manufactured
Date posted: February 6, 2017. Answers (1)
- When a few drops of aqueous ammonia were added to copper (II) nitrate solution, a light blue precipitate was formed(Solved)
When a few drops of aqueous ammonia were added to copper (II) nitrate solution, a light blue precipitate was formed. On addition of more aqueous ammonia, a deep blue solution was formed. Identify the substance responsible for the:
i) Light blue precipitate
ii) Deep blue solution
Date posted: February 6, 2017. Answers (1)
- Give one use of nitric (V) acid(Solved)
Give one use of nitric (V) acid.
Date posted: February 6, 2017. Answers (1)
- State one use of sodium hydrogen carbonate(Solved)
State one use of sodium hydrogen carbonate.
Date posted: February 6, 2017. Answers (1)
- Name one suitable reagent that can be reacted with concentrated sulphuric (VI) acid to produce nitric (V) acid(Solved)
Name one suitable reagent that can be reacted with concentrated sulphuric (VI) acid to produce nitric (V) acid.
Date posted: February 6, 2017. Answers (1)
- The use of materials made of lead in roofing and in water pipes is being discouraged. State:(Solved)
The use of materials made of lead in roofing and in water pipes is being discouraged. State:
i) Two reasons why these materials have been used in the past
ii) One reason why their use is being discouraged
Date posted: February 6, 2017. Answers (1)
- Why is high temperature required for nitrogen to react with oxygen?(Solved)
Explain why a high temperature is required for nitrogen to react with oxygen.
Date posted: February 6, 2017. Answers (1)
- Give two use of ammonia(Solved)
Give two use of ammonia.
Date posted: February 6, 2017. Answers (1)
- Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment(Solved)
Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment.
Date posted: February 6, 2017. Answers (1)
- Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas(Solved)
a) Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas
b) Name one suitable drying agent for ammonia gas
Date posted: February 6, 2017. Answers (1)
- Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated...(Solved)
Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
Date posted: February 6, 2017. Answers (1)
- Describe how nitrogen gas is obtained from the liquid air(Solved)
Describe how nitrogen gas is obtained from the liquid air.
Date posted: February 6, 2017. Answers (1)
- Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas(Solved)
a)Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas
b) Name one suitable drying agent for ammonia gas
Date posted: February 3, 2017. Answers (1)
- State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid(Solved)
State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid.
Date posted: February 3, 2017. Answers (1)
- Why is it advisable to obtain nitrogen from air instead of from ammonia(Solved)
Why is it advisable to obtain nitrogen from air instead of from ammonia.
Date posted: February 3, 2017. Answers (1)