5.2 Quantitative Analysis

• Quantitative analysis involves measuring the quantity of each element
• Match the quantitative analysis method with its principle:

  Gravimetric Analysis ↔️ Measures mass of precipitate

  Volumetric Analysis ↔️ Reacts solution with known reagent

  Spectrophotometry ↔️ Measures absorption of light
• Volumetric analysis involves reacting a solution with a known reagent
• Match the quantitative analysis technique with its purpose:

  Pipetting ↔️ Accurately dispenses volumes

  Titration ↔️ Determines exact concentration

  Weighing ↔️ Measures the mass of substances
• Accurate measurements are crucial for reliable results in quantitative analysis.


  True
• What instrument is used in gravimetric analysis to measure the mass of a precipitate?

  Analytical balance
• Pipetting, titration, and weighing are basic laboratory techniques in quantitative analysis.


  True
• What type of equipment is used to calibrate pipettes in pipetting?

  Standard solution
• Basic laboratory techniques in quantitative analysis ensure accurate and precise results.


  True
• The molar mass of a substance is typically measured in grams
• The concentration of a solution is calculated using the formula \(c = \frac{n}{V}\), where n is the number of moles
• What is the calculated mass of 0.25 moles of a substance with a molar mass of 98.1 g/mol?

  24.525 g
• Calculate the number of moles in 10 g of NaCl, given its molar mass is 58.5 g/mol.

  0.171 mol
• What does quantitative analysis measure?

  Quantity of each element
• What type of instrumentation is used in gravimetric analysis?

  Analytical balance
• Spectrophotometry determines the concentration of colored compounds by measuring the absorption or transmission
• Order the steps involved in pipetting for quantitative analysis:

  1️⃣ Calibrate the pipette

  2️⃣ Draw the liquid to the calibration mark

  3️⃣ Dispense the liquid accurately
• In titration, a burette is used to determine the exact concentration
• Why is weighing critical in quantitative analysis?

  Determines reactant quantities
• The formula to calculate moles is \( n = \frac{m}{M
• Calculate the mass of 0.5 moles of NaCl, given its molar mass is 58.5 g/mol.

  29.25 g
• What is the amount of substance that contains exactly 6.022 × 10^23 particles called?

  Mole
• The formula to calculate mass (m) is m = n × M
• The formula to calculate concentration (c) is c = n/V.


  True
• What law does balancing chemical equations adhere to?

  Law of Conservation of Mass
• Quantitative analysis skills are applied in the pharmaceutical industry for drug formulation and quality control
• What does gravimetric analysis measure?

  Mass of precipitate
• In gravimetric analysis, the analytical balance is used to measure the mass of the precipitate.
• Volumetric analysis uses a burette to react a solution with a known reagent.


  True
• Match the method of quantitative analysis with its principle:

  Gravimetric Analysis ↔️ Measures mass of precipitate

  Volumetric Analysis ↔️ Reacts solution with known reagent

  Spectrophotometry ↔️ Measures absorption of light
• What does gravimetric analysis measure?

  Mass of precipitate
• Volumetric analysis involves reacting a solution with a known reagent
• What instrument is used in spectrophotometry?

  Spectrophotometer
• Quantitative analysis measures the quantity of each element in a compound.

  True
• What is an example of titration in quantitative analysis?

  Titrating NaOH with HCl
• Molar mass is the mass of one mole
• Balanced chemical equations provide ratios between reactants and products.


  True
• How many moles are in 10 g of NaCl (molar mass = 58.5 g/mol)?

  0.171 mol
• Concentration is calculated by dividing moles by volume
• What is a limiting reactant?

  Completely consumed reactant