Question

A mineral wate bottle contains 28mg of calcium in 100 cmcube of solution. What is the concentration in g/dmcube?​

Answer 1

Answer:

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Class 12>>Chemistry>>Solutions>>Expressing Concentration of Solutions>>The concentration of a 100 ml solution c

Question

The concentration of a 100 ml solution containing X grams of Na2CO3 (mol. wt. = 106) is Y M. The values of X and Y are respectively:

A

2.12,0.05

B

1.06,0.2

C

1.06,0.1

D

2.12,0.1

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Solution

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Correct option is C)

As per question,

Concentration=Volume (litre)No. of moles

Y=1000100106X

⇒106Y=10X 

Dividing both sides by 100 we get:

⇒1.06X=0.1Y

Answer 2

Answer:

data

mass of solute =28 mg = 28÷1000 = 0.028g

volume of solution= 100 cm3 = 100 ÷ 1000= 0.1 dm3

Explanation:

concentration in g/ dm3 = mass of solute in g/

volume of solution in dm3

= 0.028÷0.1

=0.28 g/dm3

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