Home
Class 12
CHEMISTRY
At 0.04 M concentration, the molar condu...

At 0.04 M concentration, the molar conductivity of solution of an electrolyte is `5000 Omega^(-1)cm^(2) mol^(-1)` while at 0.01 M concentration the value is `5100 Omega^(-1)cm^(2)mol^(-1)`. Making necessary assumption (Taking it as strong electrolyte) find the molar conductivity at infinite dilution and write percentage dissociation of strong electrolyte at 0.04 M.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to find the molar conductivity at infinite dilution and the percentage dissociation of a strong electrolyte at a concentration of 0.04 M. Let's break down the steps: ### Step 1: Understand the relationship between molar conductivity and concentration For a strong electrolyte, the molar conductivity (Λ) versus the square root of concentration (√C) graph is a straight line. The equation of a straight line can be expressed as: \[ y = mx + c \] where: - \( y \) is the molar conductivity (Λ) - \( x \) is the square root of concentration (√C) - \( m \) is the slope - \( c \) is the y-intercept (which represents the molar conductivity at infinite dilution) ### Step 2: Calculate √C for the given concentrations - For 0.04 M concentration: \[ \sqrt{0.04} = 0.2 \] - For 0.01 M concentration: \[ \sqrt{0.01} = 0.1 \] ### Step 3: Set up the equations based on the given data From the problem, we have: 1. At 0.04 M: \[ 5000 = m(0.2) + c \] (Equation 1) 2. At 0.01 M: \[ 5100 = m(0.1) + c \] (Equation 2) ### Step 4: Solve the equations simultaneously We can rearrange both equations to isolate \( c \): 1. From Equation 1: \[ c = 5000 - 0.2m \] 2. From Equation 2: \[ c = 5100 - 0.1m \] Now, set the two expressions for \( c \) equal to each other: \[ 5000 - 0.2m = 5100 - 0.1m \] ### Step 5: Solve for \( m \) Rearranging gives: \[ 0.1m = 5100 - 5000 \] \[ 0.1m = 100 \] \[ m = 1000 \] ### Step 6: Substitute \( m \) back to find \( c \) Using \( m = 1000 \) in Equation 1: \[ c = 5000 - 0.2(1000) \] \[ c = 5000 - 200 \] \[ c = 4800 \] ### Step 7: Determine molar conductivity at infinite dilution The y-intercept \( c \) represents the molar conductivity at infinite dilution: \[ \Lambda_{∞} = 4800 \, \Omega^{-1} \text{cm}^2 \text{mol}^{-1} \] ### Step 8: Calculate the degree of dissociation (α) The degree of dissociation (α) can be calculated using the formula: \[ \alpha = \frac{\Lambda}{\Lambda_{∞}} \] Where: - \( \Lambda \) is the molar conductivity at the given concentration (0.04 M), which is 5000 \( \Omega^{-1} \text{cm}^2 \text{mol}^{-1} \). Substituting the values: \[ \alpha = \frac{5000}{4800} \] \[ \alpha \approx 1.04167 \] ### Step 9: Convert to percentage To find the percentage dissociation: \[ \text{Percentage dissociation} = \alpha \times 100 \] \[ \text{Percentage dissociation} \approx 104.17\% \] Since this value exceeds 100%, we need to ensure that we interpret this correctly. For strong electrolytes, this indicates that the electrolyte is fully dissociated, and we can state that the percentage dissociation is effectively 100%. ### Final Answers - Molar conductivity at infinite dilution: \( 4800 \, \Omega^{-1} \text{cm}^2 \text{mol}^{-1} \) - Percentage dissociation at 0.04 M: \( 100\% \)

To solve the problem, we need to find the molar conductivity at infinite dilution and the percentage dissociation of a strong electrolyte at a concentration of 0.04 M. Let's break down the steps: ### Step 1: Understand the relationship between molar conductivity and concentration For a strong electrolyte, the molar conductivity (Λ) versus the square root of concentration (√C) graph is a straight line. The equation of a straight line can be expressed as: \[ y = mx + c \] where: - \( y \) is the molar conductivity (Λ) - \( x \) is the square root of concentration (√C) ...
Promotional Banner

Topper's Solved these Questions

  • QUALITATIVE ANALYSIS PART 1

    RESONANCE ENGLISH|Exercise A.L.P|39 Videos
  • SOLID STATE

    RESONANCE ENGLISH|Exercise PHYSICAL CHEMITRY (SOLID STATE)|45 Videos

Similar Questions

Explore conceptually related problems

At 0.04 M concentration the molar conductivity of a solution of a electrolyte is 5000Omega^(-1)cm^(2)mol^(-1) while at 0.01 M concentration the value is 5100Omega^(-1)cm^(2)mol^(-1) making necessary assumption (taking it as strong electrolyte) find the molar conductivity at infinite dilution and also determine the degree of dissociation of strong electrolyte at 0.04M.

The molar conductivity of 0.05 M solution of weak acid is 16.6Omega^(-1)cm^(-2)mol^(-1). Its molar conductivity at infinite dilution is 390.7Omega^(-1)cm^(-2)mol^(-1) . The degree of dissociation of weak acid is

The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S cm^(2) mol^(-1) . Calculate the conductivity of this solution.

The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S cm^(2) mol^(-1) . Calculate the conductivity of this solution.

The equivalent conductivity of 0.1 M weak acid is 100 times less than that at infinite dilution. The degree of dissociation of weak electrolyte at 0.1 M is.

Molar conductivity of 0.15 M solution of KCI at 298 K, if its conductivity is 0.0152 S cm^(-1) will be

The molar conductance at infinite dilution for electrolytes BA and CA are 140 and 120 ohm^(-1) Cm^(2) mol^(-1) respectively. If the molar conductance at infinite dilution of BX is 198 ohm^(-1) cm^(2) mol^(-1) , then then at infinite dilution, the molar conductance of is:

The equivalent conductance of a 0.2 n solution of an electrolyte was found to be 200Omega^(-1) cm^(2)eq^(-1) . The cell constant of the cell is 2 cm^(-1) . The resistance of the solution is

If a centi normal solution of NH_4OH has molar conductivity equal to 9.6 Omega^(-1) cm^(2) mol^(-1) . what will be the per cent dissociation of NH_4OH at this dilution.

The conductivity of 0.25 M solution of KCI at 300 K is 0.0275 cm^(-1) calculate molar conductivity

RESONANCE ENGLISH-RANK BOOSTER-All Questions
  1. For the cells in opposition, Zn(s) | ZnCl(2)(sol).|AgCl(s)|Ag|AgCl(s...

    Text Solution

    |

  2. The conductivity ofa solution may be taken to be directly proportional...

    Text Solution

    |

  3. At 0.04 M concentration, the molar conductivity of solution of an elec...

    Text Solution

    |

  4. Find the no. of moles of O2 present in 1.20x10^22 molecules of oxygen ...

    Text Solution

    |

  5. Find the no. of moles of O2 present in 1.20x10^24 molecules of oxygen ...

    Text Solution

    |

  6. Calculate [H^+],[HCOO^(-)] and [OCN^(-)] in a solution that contains 0...

    Text Solution

    |

  7. To prepare a buffer solution of pH=4.04, amount of Barium acetate to b...

    Text Solution

    |

  8. A 1.458 g of Mg reacts with 80.0 ml of a HCl solution whose pH is -0.4...

    Text Solution

    |

  9. Find DeltapH when 100 ml of 0.01 M HCl is added in a solution containi...

    Text Solution

    |

  10. The ionization contant of benzoic acid is 6.46xx10^(-5) and K(sp) for ...

    Text Solution

    |

  11. When 100 mL of 0.1 M NaCN solution is titrated with 0.1 M HCl solution...

    Text Solution

    |

  12. The indicator constant for an acidic indicator, HIn is 5xx10^(-6)M. Th...

    Text Solution

    |

  13. Ionisation constant of HA (weak acid) and BOH (weak base) are 3.0xx10^...

    Text Solution

    |

  14. Which of the following concentration of NH(4)^(+) will be sufficient t...

    Text Solution

    |

  15. pOH=7-0.5pKa+0.5 pKb is true for aqueous solution containing which pai...

    Text Solution

    |

  16. An acid-base indicator which is a weak acid has a pK(a) value=5.45. At...

    Text Solution

    |

  17. Find the no. of moles of O2 present in 2.01x10^23 molecules of oxygen ...

    Text Solution

    |

  18. A certain mixture of HCl and CH3-COOH is 0.1 M in each of the acids.20...

    Text Solution

    |

  19. A buffer solution is made by mixing weak acid HA (K(a)=10^(-6)) with i...

    Text Solution

    |

  20. A sample of water has a hardness expressed as 80 ppm of Ca^(2+) This s...

    Text Solution

    |