3 years ago

To prevent poisoning, what three items should NEVER be taken into the lab?

Chemistry

1 answer:

Roman55 [17]3 years ago

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The answer of this answer is given in the attached file

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Give an example of two elements that would form a covalent bond

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<span>Hydrogen carbon and oxygen commonly form covalent bonds.
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The voltage for the following cell is +0.731 V. Find Kb for the organic base RNH2. Use EscE 0.241V.

tino4ka555 [31]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value is $K_b = 1.89 *10^{-6}$

Explanation:

From the question we are told that

The voltage of the cell is $V = 0.731 \ V$

Generally $K_b$ is mathematically represented as

$K_b = \frac{K_w }{ K_a }$

Where $K_w$ is the equilibrium constant for this auto-ionization of water with a value $K_w = 1.0 *10^{-14}$

Generally the $E_{cell}$ is mathematically represented as

$E_{cell} = V - E_{SCE}$

=> $E_{cell} = 0.731 - 0.241$

=> $E_{cell} = 0.49 V$

This $E_{cell}$ is mathematically represented as

$E_{cell} = \frac{0.0592}{n} * log K_a$

Where n is the number of moles which in this question is n = 1

$0.490 = \frac{0.0592}{1} * log K_a$

=> $K_a = 5.30*10^{-9}$

$K_b = \frac{ K_w}{ K_a}$

=> $K_b = \frac{1.0 *10^{-14}}{ 5.30*10^{-9}}$

=> $K_b = 1.89 *10^{-6}$

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