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Dima020 [189]
3 years ago
14

I NEED HELP THIS IS DUE TMR!

Chemistry
1 answer:
butalik [34]3 years ago
3 0

Answer:

The density of copper is 8.9 grams per cubic centimeter.

Explanation:

There is a writing mistake in statement, correct form is written below:

<em>A 124.6 grams sample of copper has a volume of 14 cubic centimeters. What is the density of copper?</em>

Let suppose that mass of the copper sample is distributed uniformly in its volume, then we shall use the following definition of density (\rho), in grams per cubic centimeter:

\rho = \frac{m}{V} (1)

Where:

m - Mass, in grams.

V - Volume, in cubic centimeters.

If we know that m = 124.6\,g and V = 14\,cm^{3}, then the density of the sample of copper is:

\rho = \frac{m}{V}

\rho = 8.9\,\frac{g}{cm^{3}}

The density of copper is 8.9 grams per cubic centimeter.

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Answer

pH=8.5414

Procedure

The Henderson–Hasselbalch equation relates the pH of a chemical solution of a weak acid to the numerical value of the acid dissociation constant, Kₐ. In this equation, [HA] and [A⁻] refer to the equilibrium concentrations of the conjugate acid-base pair used to create the buffer solution.

pH = pKa + log₁₀ ([A⁻] / [HA])

Where

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First, calculate the pKa

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pH=8.6383+\log_{10}(\frac{0.40\text{ M}}{0.50\text{ M}})=8.5414

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