Rubicon Formulations QC Chemist Interview Questions and Answers

A pH meter is an electronic device used to measure the acidity or alkalinity of a solution.

• pH meter measures the concentration of hydrogen ions in a solution

• The range of a pH meter is typically from 0 to 14

• A pH of 7 is considered neutral, below 7 is acidic, and above 7 is alkaline

• pH meters are commonly used in chemistry, biology, and environmental science

Molecular weights of HCl and sulfuric acid are 36.46 g/mol and 98.08 g/mol respectively.

• HCl has one hydrogen atom and one chlorine atom, with a molecular weight of 36.46 g/mol.

• Sulfuric acid has two hydrogen atoms, one sulfur atom, and four oxygen atoms, with a molecular weight of 98.08 g/mol.

• Molecular weight is calculated by adding the atomic weights of all the atoms in a molecule.

Normality is the concentration of a solution expressed as the number of equivalents of solute per liter of solution. Molarity is the concentration of a solution expressed as the number of moles of solute per liter of solution.

• Normality is a measure of the concentration of a solution in terms of the number of equivalents of solute per liter of solution.

• Molarity is a measure of the concentration of a solution in terms of...read more

Melting point is the temperature at which a solid substance turns into a liquid. Boiling point is the temperature at which a liquid substance turns into a gas.

• Melting point is a physical property of a substance

• It is the temperature at which the solid and liquid phases of a substance are in equilibrium

• Boiling point is also a physical property of a substance

• It is the temperature at which the vapor pressure of a liquid eq...read more

Lambert Beers law states that the absorbance of a solution is directly proportional to the concentration of the absorbing species.

• The law is used to determine the concentration of a substance in a solution by measuring its absorbance.

• It assumes that the absorbing species is uniformly distributed throughout the solution.

• The law is often used in spectroscopy and colorimetry.

• The equation for the law is A = εlc, where A is...read more

Titration is a technique used to determine the concentration of a substance in a solution by reacting it with a solution of known concentration.

• Acid-base titration

• Redox titration

• Complexometric titration

• Precipitation titration

• Back titration