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3 years ago

What the effect of temperature on Molarity, Molality ,Normality ? Explain.

Chemistry

1 answer:

mr Goodwill [35]3 years ago

8 0

Explanation:

Molality is the number of moles present in kilogram of solution. Mathematically, expression for molality is as follows.

Molality = $\frac{\text{no. of moles}}{\text{mass in kg}}$

As we increase the temperature of a solution then there occurs no change in its mass as well as no change in its number of moles. As a result, there will occur no change in molality of the solution.

Molarity is the number of moles present in liter of solution. So, with change in temperature there occurs change in volume of the solution. Hence, molarity will also change.

Normality is no. of gram equivalents per liter of solution. As normality is also dependent on volume and when there occurs a change in temperature then volume of solution also changes. As a result, normality will also change with change in temperature.

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Answer:

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What sample size (grams) of Na3PO4 (FW 164.00) known to be 50.00% pure should be used to consume exactly 40.00 mL of 0.1000 M HC

Mkey [24]

Answer:

0.109 g.

Explanation:

Equation of the reaction:

Na3PO4 + 3HCl --> 3NaCl + H3PO4

Number of moles of HCl = molar concentration × volume

= 0.1 × 0.04

= 0.004 mol.

By stoichiometry, 1 mole of Na3PO4 neutralises 3 moles of HCl. Therefore, number of moles of Na3PO4 = 0.004/3

= 0.0013 mol

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4 years ago

Which equation best describes the net changes based upon the observation that solid silver nitrate and solid potassium chloride

stealth61 [152]

Answer:

The correct option is: AgNO₃(aq) + KCl(aq) = AgCl(s) + KNO₃(aq)

Explanation:

Precipitation reaction is a chemical reaction that involves reaction between two soluble salts to give an insoluble salt. This insoluble salt exists as a solid and settles down.

Therefore, the solid formed in a precipitation reaction is known as the precipitate.

As the solid silver nitrate (AgNO₃) and solid potassium chloride (KCl) are soluble in water, therefore, their aqueous solutions are represented as AgNO₃(aq) and KCl(aq), respectively.

The precipitation reaction of AgNO₃(aq) and KCl(aq) gives an insoluble salt, silver chloride (AgCl) and a soluble salt, potassium nitrate (KNO₃).

The insoluble salt, AgCl is called the precipitate and is represented as AgCl(s). Whereas, the soluble salt, KNO₃ is represented as KNO₃ (aq).

Therefore, the chemical equation for this precipitation reaction is:

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3 years ago

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A = ∈LC
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L is the path length
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A = 2 - log(%T)
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