Four students A, B, C and D verified the law of conservation of mass in a chemical reaction of calcium chloride and sodium sulphate .All of them used 108.2 g of calcium chloride and 115.1 g of sodium sulphate solution and mixed them in a beaker of mass 160g.They reported their results as follows :
Student
Colourless mixture after mixing
Mass of reaction mixture in the beaker including mass of beaker
A
White precipitate
383.3 g
B
Brown precipitate
373.3 g
C
White precipitate
363.3 g
D
Brown precipitate
383.3 g
a
Student A is correct only because he observed white precipitate of calcium sulphate.
YES/NO
b
Students A and C are correct because both observed white precipitate of calcium sulphate.
YES/NO
c
Student D is correct because he calculated mass of reaction mixture in the beaker including mass of beaker is 383.3 g.
YES/NO
d
Student A is correct because he observed white precipitate of calcium sulphate and evaluated mass of reaction mixture in the beaker including mass of beaker is 383.3 g.
YES/NO
Answers
Answer:
A Is the answer
Explanation:
Answer:
d. student A calculated the mass of reaction mixture is 383.3 g and observed a white precipitate of calcium sulphate, he is the correct one among the four students.
Explanation:
Given that, Mass of sodium sulphate =115.1 g
Mass of calcium chloride = 108.2g.
Mass of beaker = 160 g
Total mass of reaction mixture in the beaker including mass of Beaker = 115.1g + 108.2g + 160g = 383.3 g.
Calcium chloride and sodium sulphate reacts to for a white precipitate of calcium sulfate, which is an ionic compound insoluble in water and a sodium chloride solution.
So, as student A calculated the mass of reaction mixture is 383.3 g and observed a white precipitate of calcium sulphate, he is the correct one among the four students.
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