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The number of equivalents of Na2S2O3 required for the volumetric estimation of one equivalent of Cu2+ is
  • a)
    1
  • b)
    2
  • c)
    3 2
  • d)
    3
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The number of equivalents of Na2S2O3 required for the volumetric estim...
Volumetric estimation of Cu2+ is carried out iodometrically as follows:
2 Cu2+ + 4 Kl = 2 Cul2 + 4K+
2 Cul2 = 2 Cul + l2
This liberated l2 is titrated against Na2S2O3 solution
2Na2S2O3 + l2 = Na2S4O6 + 2 Nal
2 moles Cu2+ ions ≡ 1 mole l2 ≡ 2 moles of Na2S2O3
∴ 1 mole Cu2+ ion ≡ 1 mole Na2S2O3
Eq. wt. of Na2S2O3 = mol. wt
∴ 1 mole Cu2+ ion ≡ 1 Eq. wt. of Na2S2O3
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The number of equivalents of Na2S2O3 required for the volumetric estim...
Explanation:

To understand why the correct answer is option 'A', let's break down the given information and concept step by step.

1. Equivalent:
In chemistry, the term "equivalent" is used to compare the combining capacity of different substances. One equivalent of a substance is defined as the amount of that substance which combines with or replaces one equivalent of another substance in a chemical reaction.

2. Volumetric estimation:
Volumetric estimation, also known as titration, is a quantitative chemical analysis technique used to determine the concentration of a specific substance in a solution. In this technique, a solution of known concentration (titrant) is added to a solution of unknown concentration (analyte) until the reaction between the two is complete. By measuring the volume of titrant required to reach the endpoint of the reaction, the concentration of the analyte can be determined.

3. Reaction between Cu2+ and Na2S2O3:
In this question, the reaction between copper(II) ions (Cu2+) and sodium thiosulfate (Na2S2O3) is used for volumetric estimation. The balanced chemical equation for this reaction is:

Cu2+ + 2S2O32- → CuS + S4O62-

From the equation, we can see that 1 equivalent of Cu2+ reacts with 2 equivalents of S2O32- to form CuS.

4. Number of equivalents of Na2S2O3 required:
To determine the number of equivalents of Na2S2O3 required for one equivalent of Cu2+, we need to compare the stoichiometric coefficients of Cu2+ and S2O32- in the balanced equation.

From the balanced equation, we can see that:
- 1 equivalent of Cu2+ reacts with 2 equivalents of S2O32-
- 2 equivalents of S2O32- are required for 1 equivalent of Cu2+

Therefore, the correct answer is option 'A', which states that one equivalent of Na2S2O3 is required for the volumetric estimation of one equivalent of Cu2+.
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Volumetric analysis is based on the principle of equivalence a that minloces lead in the ratio of their equivalents. At the equivalence point of the reaction, involving the reactahts A and B : Number of gram equivalents of A = Number of gram equivalents of B..If VA ml of solution A having normality NA react just completely with VB ml of solution B having normalityNB thenEquation(1), called normality equation is very useful in numerical of volumetric analysis. Equivalent masses of different substances :Basically the equivalent mass of a substance is defined as the pads by seam ctituhich combine with or displace 1.0078 parts (1part) by mass of hydrogen, 8 parts by mansetaisiosaid 35.5 parts by mass of chlorine.Mass of a substance expressed in gram equal to its equivalent man is gam equivalent mass. Equivalent mass of a substance is not constant but depends upon the maw i malice the substance participates.Equivalent mass of an acid in acid-base reaction is its mass in grannehidicodoinisooleaf replaceable Fi ions (= 1.0078 g1g).0n the other hand, equivalent mass of a bagels istolonellfacontairis 1 mole of replaceable 0H ions. 1 g equivalent mass each of an acid and base an ionclinegins saint and 1 mole of water= 18 g). Equivalent mass of an oxidising agent is its mass which gains 1 mole at ellecismitcan be obtained by dividing the molecular mass or formula mass by the total decrease in aididditaiiilberef one or more elements per molecule.0n the other hand, equivalent mass of a reducing agent is the mass of the substance which loses 1 mole of electorns. It can be calculated by dividing the molecular or formula mass of the subtance by the total increase in oxidation number of one or more elements per molecular or formula mass.Q.How many gram of phosphoric acid (H3PO4) would be required to neutralize 58 g of magnesium hydroxide?

Volumetric analysis is based on the principle of equivalence a that minloces lead in the ratio of their equivalents. At the equivalence point of the reaction, involving the reactahts A and B : Number of gram equivalents of A = Number of gram equivalents of B..If VA ml of solution A having normality NA react just completely with VB ml of solution B having normalityNB thenEquation(1), called normality equation is very useful in numerical of volumetric analysis. Equivalent masses of different substances :Basically the equivalent mass of a substance is defined as the pads by seam ctituhich combine with or displace 1.0078 parts (1part) by mass of hydrogen, 8 parts by mansetaisiosaid 35.5 parts by mass of chlorine.Mass of a substance expressed in gram equal to its equivalent man is gam equivalent mass. Equivalent mass of a substance is not constant but depends upon the maw i malice the substance participates.Equivalent mass of an acid in acid-base reaction is its mass in grannehidicodoinisooleaf replaceable Fi ions (= 1.0078 g1g).0n the other hand, equivalent mass of a bagels istolonellfacontairis 1 mole of replaceable 0H ions. 1 g equivalent mass each of an acid and base an ionclinegins saint and 1 mole of water= 18 g). Equivalent mass of an oxidising agent is its mass which gains 1 mole at ellecismitcan be obtained by dividing the molecular mass or formula mass by the total decrease in aididditaiiilberef one or more elements per molecule.0n the other hand, equivalent mass of a reducing agent is the mass of the substance which loses 1 mole of electorns. It can be calculated by dividing the molecular or formula mass of the subtance by the total increase in oxidation number of one or more elements per molecular or formula mass.Q.9.8 g of an acid on treatment with excess of an alkali forms salt along with 3.6 g of water. What is the equivalent mass of the acid?

Volumetric analysis is based on the principle of equivalence a that minloces lead in the ratio of their equivalents. At the equivalence point of the reaction, involving the reactahts A and B : Number of gram equivalents of A = Number of gram equivalents of B..If VA ml of solution A having normality NA react just completely with VB ml of solution B having normalityNB thenEquation(1), called normality equation is very useful in numerical of volumetric analysis. Equivalent masses of different substances :Basically the equivalent mass of a substance is defined as the pads by seam ctituhich combine with or displace 1.0078 parts (1part) by mass of hydrogen, 8 parts by mansetaisiosaid 35.5 parts by mass of chlorine.Mass of a substance expressed in gram equal to its equivalent man is gam equivalent mass. Equivalent mass of a substance is not constant but depends upon the maw i malice the substance participates.Equivalent mass of an acid in acid-base reaction is its mass in grannehidicodoinisooleaf replaceable Fi ions (= 1.0078 g1g).0n the other hand, equivalent mass of a bagels istolonellfacontairis 1 mole of replaceable 0H ions. 1 g equivalent mass each of an acid and base an ionclinegins saint and 1 mole of water= 18 g). Equivalent mass of an oxidising agent is its mass which gains 1 mole at ellecismitcan be obtained by dividing the molecular mass or formula mass by the total decrease in aididditaiiilberef one or more elements per molecule.0n the other hand, equivalent mass of a reducing agent is the mass of the substance which loses 1 mole of electorns. It can be calculated by dividing the molecular or formula mass of the subtance by the total increase in oxidation number of one or more elements per molecular or formula mass.Q.100 ml of 0.1 M H3 P02 is titrated with 0.1 M NaOH. The volume of NaOH needed will be

Volumetric analysis is based on the principle of equivalence a that minloces lead in the ratio of their equivalents. At the equivalence point of the reaction, involving the reactahts A and B : Number of gram equivalents of A = Number of gram equivalents of B..If VA ml of solution A having normality NA react just completely with VB ml of solution B having normalityNB thenEquation(1), called normality equation is very useful in numerical of volumetric analysis. Equivalent masses of different substances :Basically the equivalent mass of a substance is defined as the pads by seam ctituhich combine with or displace 1.0078 parts (1part) by mass of hydrogen, 8 parts by mansetaisiosaid 35.5 parts by mass of chlorine.Mass of a substance expressed in gram equal to its equivalent man is gam equivalent mass. Equivalent mass of a substance is not constant but depends upon the maw i malice the substance participates.Equivalent mass of an acid in acid-base reaction is its mass in grannehidicodoinisooleaf replaceable Fi ions (= 1.0078 g1g).0n the other hand, equivalent mass of a bagels istolonellfacontairis 1 mole of replaceable 0H ions. 1 g equivalent mass each of an acid and base an ionclinegins saint and 1 mole of water= 18 g). Equivalent mass of an oxidising agent is its mass which gains 1 mole at ellecismitcan be obtained by dividing the molecular mass or formula mass by the total decrease in aididditaiiilberef one or more elements per molecule.0n the other hand, equivalent mass of a reducing agent is the mass of the substance which loses 1 mole of electorns. It can be calculated by dividing the molecular or formula mass of the subtance by the total increase in oxidation number of one or more elements per molecular or formula mass.Q.Which of the following solutions, when mixed with 100 ml of 0.05 M NaOH, will give a neutral solution?

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The number of equivalents of Na2S2O3 required for the volumetric estimation of one equivalent of Cu2+ isa)1b)2c)3 2d)3Correct answer is option 'A'. Can you explain this answer?
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