Chemistry, 22.08.2019 03:30 shymitch32

Ahittorf cell fitted with ag/agcl electrodes is filled with 0.0106 molal aqueous hcl (molar mass: 36.458). a 2.00 ma current was passed for 10800 sec. the cathode solution was then found to weigh 51.7436 g and contain 0.0267 g hcl after analysis. what is the transport number of h+?
a. 0.177
b. 0355
c. 0.645
d. 0.823

Answers: 2

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Answers

Answer from: julih74

Explanation:

The given data is as follows.

Current = $2 \times 10^{-3}$ A

Time = 10800 sec

Weight of cathode solution = 51.7436 g

Weight of HCl after analysis = 0.0267 g (in cathode solution)

Weight of anode solution = 52.0461 g

Weight of HCl in anode solution = 0.0133 g

Amount of electrolyte present = molality × molar mass

= $0.0106 \times 36.4 \times 10^{-3}$

= $0.385 \times 10^{-3} g$

Calculate the amount of HCl initially present as follows.

Electricity passed = $2 \times 10^{-3} \times 10800$ = 21.6 C

Hence, amount of electrons passed will be as follows.

$\frac{21.6 C}{96500 C/mol}$

= 0.00024 mol

Therefore, mass of HCl initially present is as follows.

= (51.7436 - 0.0267)

= 51.7169 g of water

= $\frac{0.3856 \times 10^{-3}}{1g H_{2}O} \times 51.7169 g H_{2}O$

= 0.01994 g

Mass of HCl present after the electrolysis in 51.7169 g of $H_{2}O$ = 0.0267 g

Mass of HCl gained = 0.0267 - 0.01994

= 0.00676 g

Hence, the amount of HCl gained = $\frac{0.00676 g}{36.5 g/mol}$

= 0.0001853 mol

Therefore, gain of $Cl^{-}$ in cathodic compartment = 0.000224 mol

So, transport number of $H^{+}$ = $\frac{\text{Amount of HCl gained}}{\text{moles of chlorine ions gained}}$

= $\frac{0.000185}{0.00024}$

= 0.823

Thus, we can conclude that the transport number of $H^{+}$ is 0.823.

Answer from: Quest

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.

Answer from: Quest

points

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Ahittorf cell fitted with ag/agcl electrodes is filled with 0.0106 molal aqueous hcl (molar mass: 3...

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