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brilliants [131]
3 years ago
12

Calculate the ph of a solution whose(oh^-) is 4.583*10^-5 mole dm cube (pkw=14)​

Chemistry
1 answer:
Sergeu [11.5K]3 years ago
8 0

pH of solution = 9.661

<h3>Further explanation </h3>

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

pOH=-log[OH⁻]

\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339

pH+pOH=pKw

\tt pH=14-4.339\\\\pH=9.661

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6.How many moles of gas would be in contained in a 11.2 L container that is at a
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0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.

<h3>HOW TO CALCULATE NUMBER OF MOLES?</h3>

The number of moles of a substance can be calculated using the following expression:

PV = nRT

Where;

  • p = pressure (atm)
  • v = volume (L)
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0.75 × 11.2 = n × 0.0821 × 300

8.4 = 24.63n

n = 8.4 ÷ 24.63

n = 0.34 moles

Therefore, 0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.

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2 years ago
Write the complete chemical formula for the unknown compound.
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<h3>Chemical formula</h3>

The chemical formula of the compound is  C_2H_x and x is supposed to be a whole number.

In the analysis, C = 2.22 moles and H = 6.7 moles

Dividing both by the smallest: C = 1 and H = 3

Thus, the empirical formula of the compound will be CH_3

But since the compound is  C_2H_x, it means both C and H are multiplied by 2.

The chemical formula will, therefore, be C_2H_6

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3 years ago
A buffer solution is prepared by adding 13.74 g of sodium acetate (NaC2H3O2) and 15.36 g of acetic acid to enough water to make
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Answer:

A buffer solution is prepared by adding 13.74 g of sodium acetate (NaC2H3O2) and 15.36 g of acetic acid to enough water to make 500 mL of solution.

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The pH of a buffer solution can be calculated by using the Henderson-Hesselbalch equation:

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The pH of the given buffer solution can be calculated as shown below:

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