CP2 Preparation of a Standard Solution and Titration

• What is a standard solution?

  Solution with known concentration
• The accurate concentration of a standard solution is crucial for precise stoichiometric
• When preparing a standard solution, the first step is to dissolve the solute in water.

  False
• Steps for preparing a standard solution from a solid solute

  1️⃣ Weigh the solute accurately using a balance

  2️⃣ Dissolve the solute in a solvent

  3️⃣ Transfer the solution to a volumetric flask

  4️⃣ Add solvent to the graduation mark
• To prepare a standard solution from a solid solute, a volumetric flask
• Match the type of standard solution with its preparation method:

  Solid Solute ↔️ Weigh, dissolve, transfer to flask

  Liquid Solute ↔️ Measure volume, dilute in flask

  Dilution from Stock ↔️ Dilute stock solution
• The formula to calculate the mass needed to prepare a standard solution is Mass = Molarity × Volume × Molar Mass
• The first step in weighing the solute for a standard solution is to tare the balance.

  True
• Match the weighing procedure with its pros and cons:

  With Weighing Boat ↔️ Keeps balance clean, requires extra container

  Without Weighing Boat ↔️ No extra container, can spill solute easily
• When using a weighing boat, you must tare the balance after placing the weighing boat on it.


  True
• Match the procedure with its pros and cons:

  Taring with Weighing Boat ↔️ Keeps the balance clean, requires an extra container

  Taring without Weighing Boat ↔️ Simplifies process, may contaminate the balance
• Stoichiometric calculations in titrations rely on the accurate concentration of standard solutions.


  True
• The formula to calculate the mass needed to prepare a standard solution is Mass = Molarity × Volume × Molar Mass
• What does the volume in the mass formula refer to?

  Volume of the solution
• To prepare 500 mL of a 0.1 mol/L NaOH solution, you need to weigh out 2 grams of solid NaOH.


  True
• When using a weighing boat, tare the balance after placing the weighing boat
• Taring with a weighing boat simplifies the process and uses fewer materials.

  False
• Taring with a weighing boat keeps the balance clean
• Why is accurate weighing crucial in preparing standard solutions?

  Reliable titration results
• To prepare 500 mL of a 0.1 M NaOH solution, 2 grams of solid NaOH are required.


  True
• Rinsing the beaker with distilled water ensures all the dissolved solute is transferred.
• Why is using a volumetric flask with a calibrated volume mark essential?

  Accurate standard solution
• When approaching the calibration mark, it is important to avoid overfilling the flask.


  True
• Standard solutions are crucial for accurate stoichiometric calculations
• The formula "Mass = Molarity × Volume × Molar Mass" is used to calculate the mass needed to prepare a standard solution.


  True
• Molarity is measured in moles per liter
• Ensure the balance is clean, level, and calibrated
• Taring the balance with a weighing boat requires pressing the "tare" button to set the display to zero.


  True
• Using distilled water ensures the solution is free of any impurities
• A volumetric flask with a calibrated volume mark is essential for preparing an accurate standard solution.


  True
• Overfilling the volumetric flask should be corrected by carefully adjusting the water level with a dropper.


  True
• Steps to set up a titration apparatus

  1️⃣ Secure the burette in a clamp

  2️⃣ Place the receiving flask on a stirrer

  3️⃣ Add a few drops of indicator

  4️⃣ Fill the burette with titrant
• Add a few drops of the appropriate indicator to the analyte solution in the receiving flask.
• The receiving flask in a titration setup should always be placed on a magnetic stirrer plate if available.

  True
• What should you ensure about the burette stopcock before starting titrant delivery?

  It is closed
• Accurate and precise setup of a titration apparatus is crucial for obtaining reliable results.


  True
• What part of the standard solution in the burette must you adjust to the zero or starting mark?

  Meniscus
• The accurate concentration of a standard solution is crucial for precise stoichiometric calculations during titrations.
• What is the formula for calculating the mass needed to prepare a standard solution?

  Mass = Molarity \times Volume \times Molar \ Mass</latex>
• How many grams of NaOH are needed to prepare 500 mL of a 0.1 mol/L solution?

  2 grams