Reference no: EM132699724

Question 1:

Calculate the ammonium ion concentration (in mol/L) in a 100mL sample of 0.140mol/L ammonium phosphate solution.

Question 2:

Calculate the mass of solute (in grams) used to make a 225mL lithium carbonate solution if the lithium ion concentration in the solution is 0.200mol/L.

Question 3:

Joseph uses 1.82g of calcium nitrate to make a 328.0mL solution. Calculate the molar concentration (in mol/L) of this solution.

Question 4:

14.0mL stock solution of hydrochloric acid at 17.0mol/L is used to make a 0.800L of a diluted solution. Calculate the concentration (in mol/L) of the diluted solution.

Question 5:

What are the steps to making a standardized solution? Order the following options.

• Calculate mass of solute required.
• Add distilled water to volumetric flask until bottom of menicus is on the line.
• Measure exact mass of solute into weighting boat on balance.
• Dissolve solute in beaker with about 40mL of distilled water.
• Transfer solute from weighting boat to clean beaker. Rinse weighting boat with some distilled water.
• Aprons and Goggles on.
• Transfer solution to volumetric flask. Rinse beaker/stirring rod/funnel with distilled water and wash into volumetric flask.
• Stopper. Invert x 3.

Question 6:

Which of the following lab equipment are needed to make a standardized solution from a solid solute? Select all answers that apply.

• volumetric flask
• pipette
• pipetter/pipette bulb
• balance