Which of the following pairs of aqueous solutions will form a precipitate when mixed? Which of the following pairs of aqueous so
2 answers:
The chemical equations representing the reaction between the given combinations are:
1. .This reaction is a precipitation reaction as one of the product formed, CaSO
is a solid.
2. In this reaction all the products are aqueous or soluble in water.
3.. Both the products of this reaction are soluble in water.
Hence, the correct option would be 1. CaS +
Answer : The pairs of aqueous solutions form a precipitate when mixed will be, CaS + Na₂SO₄
Explanation :
Precipitation reaction : It is defined as the reaction in which an insoluble salt formed when two aqueous solutions are combined.
The insoluble salt that settle down in the solution is known an precipitate.
(a) CaS + Na₂SO₄
When aqueous solution of calcium sulfide react with aqueous solution of sodium sulfate then it gives insoluble salt of calcium sulfate and aqueous solution of sodium sulfide.
The insoluble salt that is calcium sulfate is a precipitate.
The balanced chemical reaction is:
(b) Li₂SO₄ + KOH
When aqueous solution of lithium sulfate react with aqueous solution of potassium hydroxide then it gives aqueous solution of lithium hydroxide and potassium sulfate. There is no formation of precipitate.
The balanced chemical reaction is:
(c) Li₂CO₃ + NaI
When aqueous solution of lithium carbonate react with aqueous solution of sodium iodide then it gives aqueous solution of lithium iodide and sodium sulfate. There is no formation of precipitate.
The balanced chemical reaction is:
Hence, the pairs of aqueous solutions form a precipitate when mixed will be, CaS + Na₂SO₄
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Answer : At constant pressure work is done by the system on the surroundings.
Explanation :
Work done : Any quantity that flows across the boundary of a system during a change in its state and it completely convertible into the lifting of a weight in the surroundings.
Formula for work done is:
Sign convention :
- When volume expand then system work that means work done by the system.
w = (-ve)
- When volume compress then surrounding work that means work done on the system.
w = (+ve)
The given reaction is:
This is a evaporation process in which phase changes from liquid state to gaseous state at constant temperature.
At constant pressure, work depends only on volume.
In evaporation process, the volume expand that means work is done by the system on the surroundings.
Sign convention is, w = (-ve)
Thus, at constant pressure work is done by the system on the surroundings.
Answer: The correct formula is
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here magnesium is having an oxidation state of +2 called as cation and bromine
is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral
.
The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.