Answer:
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Why should distilled water be used when conducting chemical tests?
1 answer:
Explanation:
Water is used in many tests as solvent for dissolving solutes.
No ions, compounds or salts are present in distilled water. Therefore, test result will not be affected by distilled water.
If plain water is used instead of distilled water, the ions or other salts present in plain water, may undergo chemical reaction with the reagent and may affect the test result.
Consider an example,
Concentration of is determined by potassium permanganate using titration method
solution of both and potassium permanganate are made in water.
Potassium permanganate is titrant and is used as titrand.
Concentration of is determined by end point. if the water used for making solution is not distilled, it may affect end point, which results in incorrect determination of concentration of
.
Therefore, distilled should be used for chemical tests.
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Answer:
Similarities: both state the mass of chemical species and they have the same numerical value
Differences: molecular mass refers to one single molecule and molar mass refers to one mole of a molecule
Explanation:
The molecular mass is the value of the mass of each molecule and it is measured in mass units (u). It is calculated adding the mass of each atom of the molecule.
The molar mass is the value of the mass of one mole of molecules, which means the mass of 6.022140857 × 10²³ molecules. The unit is g/mol.
For example, we can consider the methane molecule, which has the chemical formula of CH₄:
Molecular mass CH₄ = C mass + 4 x (H mass)
Molecular mass CH₄ = 12.01 + 4 x (1.01)
Molecular mass CH₄ = 16.05 u
Now to calculate the molar mass we multiply the value of the molecular mass by the Avogadro number and convert the units to g/mol:
Molar mass CH₄: 16.05 x x 6.022140857 × 10²³ mol⁻¹
Molecular mass CH₄ = 16.05 g / mol
Answer:
Explanation:
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