A solution is made by dissolving 54.0 g of silver nitrate in enough water to make 350.0 ml. A 10.00 ml portion of this solution is then diluted to a final volume of 250.0 ml. What is the total concentration of ions present in the final solution?

Answers

Answer 1

Answer:

Answer:

0.0726 M

Explanation:

Molar concentration of the final solution is the number of moles of solute (n) divided by the final volume in liters (V). This is the mathematical formula for molarity:

M = n solute / V solution in liters = n silver nitrate / V solution in liters

1) Calculate the number of moles of silver nitrate in the initial solution, dissolving 54.0 g of silver nitrate to make 350.0 ml of solution:

Solute = silver nitrate = AgNO₃

Molar mass of AgNO₃ = 169.87 g/mol

n = mass in grams / molar mass = 54.0 g / 169.87 g/mol = 0.318 mol

2) Calculate the molarity of the initial solution:

M = n / V = 0.318 mol / 0.3500 liter = 0.9086 M

3) Calculate the number of moles of silver nitrate in a 10.0 ml portion of that solution:

M = n / V ⇒n = M × V

n = 0.9086 M × 10.0 ml / (1,000 ml / liter) = 0.009086 moles silver nitrate

4) Molar concentration (molarity) of the final 250.0 ml solution:

M = n / V = 0.009086 mol / 0.2500 liter = 0.0363 M

5) Concentration of ions present in the final solution:

You must assume 100% ionization:

AgNO₃ → Ag⁺ + NO₃⁻

Then, since each mole of AgNO₃ yields two moles of ions, the total concentration of ions present is the double: 2 × 0.0363 M = 0.0726 M

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A.
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B.
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A 7.0 liter balloon at room temperature contains helium gas. if the temperature is halved, what happen to the volume?

Answers

The volume = 6.71 L

Further explanation

Charles's Law

When the gas pressure is kept constant, the gas volume is proportional to the temperature

$\tt (V_1)/(T_1)=(V_2)/(T_2)$

V₁=7 L

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What is meant by the solubility of a substance?and
What conditions must be specified when expressing the solubility of a substance

Answers

Solubility means the ability of a solute to dissolve in solvent to form a solution.

The temperature and pressure must be specified when expressing the solubility of a substance.

What is solubility?

Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a particular temperature.

The solute can be a solid, liquid or a gas.

The solubility of a solid or a liquid solute in a solvent is affected by the temperature, while the solubility of a gaseous solute is affected by both the temperature and the pressure of the gas.

Temperature must be specified because solubility varies with temperature. For gases, the pressure must also be specified. Solubility is specific for a particular solvent.

Therefore, Solubility means the ability of a solute to dissolve in solvent to form a solution.

The temperature and pressure must be specified when expressing the solubility of a substance.

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Solubility is the property of a substance (any state of matter) to whether it can be dissolved. So if a substance is soluble (i.e. salt - in water) it dissolves easily. If it is insoluble, then it does not dissolve.
Conditions that must be specified include the solute (the substance that is dissolved, such as the salt) and the solvent (the liquid in which the solute is dissolved).

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Answers

Final answer:

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Explanation:

The empirical formula H4N2O3 represents a salt used in fertilisers and it contains hydrogen, nitrogen, and oxygen. In this salt, the ions present are the ammonium ion (NH4+) and the nitrate ion (NO3-). Hydronium and nitrogen dioxide might also be present in the compound. However, the most relevant ions are generally the ammonium and the nitrate ions, because they are often used in fertilizers due to their abilities to effectively deliver nitrogen to plants.

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The empirical formula H4N2O3 suggests that in this salt, there are two nitrogen (N) atoms, three oxygen (O) atoms, and four hydrogen (H) atoms. To determine the formulae of the ions present, we can consider that hydrogen usually forms H+ ions, while nitrogen can form N3- ions, and oxygen can form O2- ions.

Based on this, the formulae of the ions present in this salt could be:

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