XL Laboratories Lab Attendant Interview Questions and Answers

pH is a measure of acidity or alkalinity in a solution, ranging from 0 to 14.

• pH stands for 'potential of hydrogen'

• It measures the concentration of hydrogen ions in a solution

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

• The pH scale is logarithmic, meaning each unit represents a tenfold difference in acidity or alkalinity

• Examples: lemon juice has a pH of around 2, water has a pH of 7, and b

Titrations is a laboratory technique used to determine the concentration of a substance in a solution.

• It involves adding a known amount of a solution of known concentration to a solution of unknown concentration until a reaction is complete.

• The point at which the reaction is complete is called the endpoint.

• The amount of the known solution added is used to calculate the concentration of the unknown solution.

• Titrations c...read more

Acid and base are chemical substances that have opposite properties and can react with each other.

• Acid: hydrochloric acid (HCl), sulfuric acid (H2SO4), acetic acid (CH3COOH)

• Base: sodium hydroxide (NaOH), potassium hydroxide (KOH), calcium hydroxide (Ca(OH)2)

pH is a measure of the acidity or alkalinity of a solution.

• pH stands for 'potential of hydrogen'.

• It is a logarithmic scale ranging from 0 to 14.

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

• pH is determined by the concentration of hydrogen ions in a solution.

• Examples: Lemon juice has a pH of around 2, while baking soda has a pH of around 9.

PH represents the concentration of hydrogen ions in a sample.

• PH is measured on a scale of 0-14, with 7 being neutral.

• A lower PH indicates higher acidity, while a higher PH indicates higher alkalinity.

• PH can be measured using a PH meter or through chemical indicators.

• The PH of a sample can affect its chemical properties and reactions.

LOD stands for Limit of Detection. It is the lowest concentration of a substance that can be reliably detected.

• LOD is used to determine the sensitivity of an analytical method.

• It is usually expressed as a concentration or mass.

• Water is a chemical compound composed of hydrogen and oxygen, while LOD is a term used in analytical chemistry.

• LOD is important in environmental testing to determine the presence of contaminants ...read more