Question

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how to verify the law of conservation of mass in a chemical reaction.

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Answer 1

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Law of conservation of mass :-

According to the law of conservation of mass the total mass of reactants is equal to total mass of products.

To verify the law of conservation of mass following condition must be satisfied :-

$\</strong><strong>s</strong><strong>t</strong><strong>a</strong><strong>r</strong><strong>\</strong><strong>s</strong><strong>f</strong><strong>\</strong><strong>g</strong><strong>r</strong><strong>e</strong><strong>e</strong><strong>n</strong><strong>$ $\boxed{\sf\green{Total mass of Reactants = Total mass of products}}$

Now, take an example and see how to verify :-

we have a reaction :-

★ Na + Cl → NaCl

now, according to law of conservation of mass the mass on L. H. S side is equal to mass on R. H. S.

Mass of Na = 23 u

Mass of chlorine = 35.5 u

Then mass of sodium chloride = 23 + 35.5 = 58.5 u

Na + Cl → NaCl

23u + 35.5u → 58.5 u

hence, this reaction verify the law of conservation of mass.

★Note★ For verification of law of conservation of mass chemical equation must be balanced.

If the chemical equation is not balanced multiply with suitable coefficients.

If chemical equation is not balanced it doesn't follow law of conservation of mass.

Answer 2

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Explanation:

Law of conservation of mass: It states that mass can neither be created nor destroyed in a chemical reaction.

During any change, physical or chemical, matter is neither created nor destroyed. However it may change from one form to another.

Experimental Verification of Law of Conservation of Mass

Requirements: H-shaped tube called Landolt's tube, Sodium chloride solution, silver nitrate solution, etc.

Procedure: A specially designed H-shaped tube is taken. Sodium chloride solution is taken in one limb of the tube and silver nitrate solution in the other limb as shown in figure. Both the limbs are now sealed and weighed. Now the tubes is averted so that the solutions can mix up together and react chemically. The reaction takes place and a white precipitate of silver chloride is obtained.

AgNO3 + NaCl → AgCl ↓ + NaNO3

Silver nitrate Sodium chloride Silver chloride Sodium nitrate

The tube is weighed again. The mass of the tube is found to be exactly the same as the mass obtained before inverting the tube. Thus, this experiment clearly verifies the law of conservation of mass.

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