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Types of Redox Reactions

77. 25 ml of ...

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77. 25 ml of a solution containing NaOH and Na2CO3(sodium bi carbonate) required (1) 50 ml of 0.2 N HCl using phenolphthalein as an indicator (2) 72 ml of 0.2N HCl when titrated using methyl orange as an indicator. The ratio of weight of NaOH and Na2CO3 in the solution is (1) 0.48 (2)0.44 (3)0.40 (4)0.38

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Q. A solution containing

N a_{2} C O_{3}

N a O H

300 m L

0.1 N H C l

using phenolphthalein as an indicator. Methyl orange is then added to the above-titrated solution when a further

25 m L

0.2 N H C l

is required. The amount of

N a O H

present in the original solution is:

Q. A solution containing

N a_{2} C O_{3}

N a O H

300 m l

0.1 N H C l

using phenolphthalein as indicator. Methyl orange is then added to the above solution when

25 m l

0.2 N H C l

is required. The amount of

N a O H

present in the solution is:

50 mL

solution having

N a O H

N a_{2} C O_{3}

0.5 M 10 mL H C l

for complete titration with phenolphthalein indicator and another

50 mL

solution require

0.5 M, 12 mL H C l

solution in methyl orange indicator then what is the ratio of number of mole of

N a O H

N a_{2} C O_{3}

?

Q. A solution contains a mixture of

N a_{2} C O_{3}

N a O H .

Using phenolphthalein as indicator

35 m L

of mixture required

20 m L

0.80 N H C l

for the end point. With methyl orange,

35 m L

of solution required

37.5 m L

H C l

for the end point. What is the weight of

N a_{2} C O_{3}

N a O H

respectively in the mixture?

20

0.1 M

solution of compound

N a_{2} C O_{3} . N a H C O_{3} .2 H_{2} O

, is titrated against

0.05 M H C l . x

H C l

is used when phenolphthalein is used as an indicator and

y

H C l

is used when methyl orange is the indicator in two separate titrations. Hence,

(y - x)

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