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Roman55 [17]
1 year ago
13

A chemist makes four successive ten-fold dilutions of 1.0x10⁻⁵ M HCl. Calculate the pH of the original solution and of each dilu

ted solution (through 1.0x10⁻⁹ M HCl).
Chemistry
1 answer:
ra1l [238]1 year ago
7 0

The pH of the original solution is 7.0.

<h3>What is pH?</h3>
  • An aqueous solution's acidity or basicity can be determined using the pH scale, which previously stood for "potential of hydrogen."
  • In comparison to basic or alkaline solutions, acidic solutions are measured to have lower pH values.
  • You need to know the hydronium ion concentration in moles per liter to determine the pH of an aqueous solution (molarity).
<h3>Calculation of pH:</h3>

At 25°C, in pure water [H₃O⁺] = 1.0 × 10⁻⁷ M

HCl after four successive ten-fold dilution = (1.0 × 10⁻⁵ M) × (1/10)⁴

= 1.0 × 10⁻⁹ M

[H₃O⁺] from HCl = 1.0 × 10⁻⁹ M ≪ 1.0 × 10⁻⁷ M

Hence, the pH of solution is almost entirely depends on the dissociation of water.

pH of the original solution = -log(1.0 × 10⁻⁷) = 7.0

Hence, the pH of the original solution is 7.0.

Learn more about pH here:

brainly.com/question/2288405

#SPJ4

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How many moles of BaSO4 are formed if 0.5 moles of Na2 SO4 react with 60 g of BaCl2? Na2 SO4 + BaCl2 → BaSO4 + 2NaCl
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<span>the balanced equation for the reaction is as follows
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number of Na2So4 moles - 0.5 mol number of BaCl2 moles - 60 g / 208 g/mol = 0.288 mol
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stoichiometry of BaCl</span>₂<span> to BaSO</span>₄<span> is 1:1.
                                                                           
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Explanation:

<h3>1.</h3>

The first and second expressions are additions and subtractions. When adding two numbers, the accuracy of the result is given by the number of decimal places in it. The result should have as many decimal places as the input with the least number of decimal places.

For example, in the first expression:

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Similarly:

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Therefore, the result should be rounded to two decimal places. Its unit should be \rm g (same as the unit of the two inputs.)

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When multiplying two numbers, the accuracy of the result should be based on the number of significant figures in it. The result should have as many significant figures as the input with the least number of significant figures. In this expression:

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Therefore, the result should have only three significant figures.

The unit of the result is supposed to be the product of the units of the input. In this expression, that unit will be \rm cm \cdot cm, which is occasionally written as \rm cm^2.

\rm 4.51 \; cm \times 3.6666 \; cm \approx 16.5\; \rm cm^2. (Rounded to three significant figures.)

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