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3 years ago

1

Chemistry

1 answer:

k0ka [10]3 years ago

7 0

Answer:

Chemical reactions takes place

Explanation:

Chemical energy stored in bonds of chemical compound are released when chemical reactions takes place.

Chemical energy is a form of potential energy that is found in chemical bonds.

When chemical reactions occur, bonds are broken and formed again.
The process of breaking and forming new bonds releases chemical energy.
In this manner most chemical reactions are often accompanied by energy changes
The energy changes is due to the formation of new bonds.

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kobusy [5.1K]

<u>Answer:</u> The volume of NaOH needed to add is 12.35 mL

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

Given mass of sulfurous acid = 0.0865 g

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$\text{Molarity of sulfurous acid}=\frac{0.0865\times 1000}{82.079\times 250}\\\\\text{Molarity of sulfurous acid}=0.0042M$

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$n_1M_1V_1=n_2M_2V_2$

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$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_3$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\\M_1=0.0042M\\V_1=250mL\\n_2=1\\M_2=0.1700M\\V_2=?mL$

Putting values in above equation, we get:

$2\times 0.0042\times 250=1\times 0.1700\times V_2\\\\V_2=\frac{2\times 0.0042\times 250}{1\times 0.1700}=12.35mL$

Hence, the volume of NaOH needed to add is 12.35 mL

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