All categories

3 years ago

Calculate the molarity of a 150 g NaCl in 250 ml solution.

Chemistry

1 answer:

Marizza181 [45]3 years ago

7 0

Answer: 10.3 mol/l

Explanation: Molality = concentration c = n/V

Amount of substance n = m/M = 150 g / 58.44 g/mol =

2,5667 mol . c = 2.5667 mol / 0.25 l = 10.2669 mol/l

c =

You might be interested in

A certain solution of methylamine has a pOH of 6.8, while a solution of pyridine has a pOH of 6.0. Which solution has a greater

Liono4ka [1.6K]

Answer:

Pyridine solution has a greater concentration of hydroxide ions.

Explanation:

The pOH of the solution is defined as negative logarithm of hydroxide ion concentration in a solution.

$pOH=-\log [OH^-]$

Higher the value of pOH lessor will be the hydroxide ion concentration and higher the concentration of hydrogen ions in the solution .
Lower the value of pOH higher will be the hydroxide ion concentration and lower the concentration of hydrogen ions in the solution.

1) The pOH of the methylamine = 6.8

$6.8=-\log[OH^-]$

$[OH^-]=1.5848\times 10^{-7} M$

2) The pOH of the pyridine = 6.0

$6.0=-\log[OH^-]$

$[OH^-]=0.000001 M=1.0\times 10^{-6} M$

Pyridine solution has a greater concentration of hydroxide ions than the solution of methylamine.

8 0

4 years ago

2 Use the chart to answer the question. Solubility Curves of Various Salts 180 160 140 120 100 80 KNO3 in g NaCl in g KCl in g A

VMariaS [17]

According to the information in the graph, it can be inferred that the amount of solute that will precipitate out of solution at 20°C is 130 grams.

<h3>How to calculate the amount of solute that precipitates out of solution?</h3>

To calculate the amount of solute that precipitates out of solution we must identify the solute data at 80°C and 20°C and identify the difference as shown below:

Quantity of solute at 80°C: 170 grams.
Quantity of solute at 20°C: 40 grams.

170 grams - 40 grams = 130 grams

According to the above, the amount of solute that will precipitate out of solution due to the change in temperature is 130 grams of KNO3.

Note: This question is incomplete because the graph is missing. Here is the graph

Learn more about solute in: brainly.com/question/7932885

#SPJ1

7 0

2 years ago

in the cell, newely made proteins move directly from the ribosomes into the rough _____ _____, where they are chemically modifie

olga nikolaevna [1]

Answer:

endoplasmic reticulum

Explanation:

there it is

8 0

3 years ago

From the list of the instructions and tips below, select the statement that would NOT lead to a successful recrystallization O D

Pachacha [2.7K]

Answer:

C. Precipitate the crystals as fast as possible

Explanation:

C. Precipitate the crystals as fast as possible

Precipitation if done fast , can lead to the formation of impure crystals , as impurities also get stuck inside the crystals. So it must be done slowly to obtain the pure crystals . Slower the crystals form , purer they are .

All the other options can lead to a successful recrystallization.

5 0

4 years ago

Write the mechanism of the reaction of methyl benzoate to form methyl 2-nitrobenzoate.

Igoryamba

The question is incorrect, nitration of methylbenzoate occurs at 3 position to get, methyl 3-nitrobenzoate.

This is because, in present reaction the reactant i.e. methylbenzoate, has low electron density at m-position.

Due to this, NO2+ prefentially attaches m-position to form methyl 3-nitro benzoate as the product.

A detailed reaction mechanism for formation of product is provided below.

3 0

4 years ago