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2 years ago

How is a standard reference electrode used to determine unknown E{half-cell)° values?

Chemistry

1 answer:

Andreas93 [3]2 years ago

3 0

A standard reference electrode can measure the potential difference between two different electrodes.

<h3>What is a standard reference electrode?</h3>

A standard reference electrode is an electrode whose potential is known.

It is physically impossible to measure the potential of a single electrode. Because only the difference between the two electrodes' potentials can be measured.

However, a way to measure the potential of different electrodes is to compare the standard cell potentials of two different galvanic cells that have one common electrode. This allows us to measure the potential difference between two different electrodes.

For example, the standard cell potential (E°) for the Zn/Cu is 1.10 V, and E° for the Zn/Co is 0.51 V. So using these values we can determine the potential difference between the Co and Cu electrodes that is 1.10 V − 0.51 V = 0.59 V.

Hence, A standard reference electrode helps to measure the potential difference between two different electrodes.

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2.92 A 50.0-g silver object and a 50.0-g gold object are both added

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Answer:

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Explanation:

1. Volume of silver

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The empirical formula for this compound that contain 31.14%sulfur and 68.86%chlorine by mass

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The empirical formula is SCl_2.

The empirical formula (EF) is the simplest whole-number ratio of atoms in a compound.

The ratio of atoms is the same as the ratio of moles.

So, our job is to calculate the molar ratio of S to Cl.

Assume that you have 100 g of sample.

Then it contains 31.14 g S and 68.86 g Cl.

Step 1. Calculate the moles of each element

Moles of S = 31.14 g S × (1 mol S/(32.06 g S) = 0.971 30 mol S

Moles of Cl = 68.86 g Cl × (1 mol Cl/35.45 g Cl) = 1.9425 mol Cl

Step 2. Calculate the molar ratio of each element

Divide each number by the smallest number of moles and round off to an integer

S:Cl = 0.971 30: 1.9425 = 1:1.9998 ≈ 1:2

Step 3: Write the empirical formula

EF = SCl_2

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