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What is the mass of NaCl required to prepare 250 mL of a 0.92% (w/v) NaCl solution?
What is the mass of NaCl required to prepare 250 mL of a 0.92% (w/v) NaCl solution?
- 2.3 g (correct)
- 1.5 g
- 4.6 g
- 3.5 g
What is the concentration of a solution in parts per million if 0.0054 g of MgCl2 is dissolved in 2000 g of solvent?
What is the concentration of a solution in parts per million if 0.0054 g of MgCl2 is dissolved in 2000 g of solvent?
- 5.4 ppm
- 2.7 ppm (correct)
- 2.7 ppm (correct)
- 10.8 ppm
What is the molarity of a solution made from 20.0 g of NaOH in 250 mL of solution?
What is the molarity of a solution made from 20.0 g of NaOH in 250 mL of solution?
- 0.75 M
- 0.50 M (correct)
- 0.25 M
- 1.00 M
What is the weight/volume percent concentration of a solution that contains 2.3 g of NaCl in 250 mL of solution?
What is the weight/volume percent concentration of a solution that contains 2.3 g of NaCl in 250 mL of solution?
What is the unit of concentration that represents the number of moles of solute per liter of solution?
What is the unit of concentration that represents the number of moles of solute per liter of solution?
What is the concentration of a solution that contains 0.92 g of NaCl in 100 mL of solution?
What is the concentration of a solution that contains 0.92 g of NaCl in 100 mL of solution?
What is the equivalent weight of CaBr2?
What is the equivalent weight of CaBr2?
How is the concentration of a solution often expressed when it contains a very small concentration of solute?
How is the concentration of a solution often expressed when it contains a very small concentration of solute?
What is the normality of a 0.4 g/100 mL solution of CaBr2?
What is the normality of a 0.4 g/100 mL solution of CaBr2?
What is the weight/volume percent concentration of a solution that contains 20 g of solute in 100 mL of solution?
What is the weight/volume percent concentration of a solution that contains 20 g of solute in 100 mL of solution?
What is the purpose of a conversion factor in solution chemistry calculations?
What is the purpose of a conversion factor in solution chemistry calculations?
How many milliequivalents of Ca2+ are present in 0.4 g of CaBr2?
How many milliequivalents of Ca2+ are present in 0.4 g of CaBr2?
What is the volume/volume percent concentration of a solution that contains 30 mL of solute in 100 mL of solution?
What is the volume/volume percent concentration of a solution that contains 30 mL of solute in 100 mL of solution?
How many grams of NaCl are contained in 500 mL of a 0.92% (w/v) NaCl solution?
How many grams of NaCl are contained in 500 mL of a 0.92% (w/v) NaCl solution?
What is the concentration of a solution that contains 25 g of solute in 200 mL of solution?
What is the concentration of a solution that contains 25 g of solute in 200 mL of solution?
How many milliequivalents of Ca2+ are present in 0.2 g of CaBr2?
How many milliequivalents of Ca2+ are present in 0.2 g of CaBr2?
What is the amount of each ion in 1 mole of solution that relates to its charge?
What is the amount of each ion in 1 mole of solution that relates to its charge?
How many equivalents are present in 0.5 mol of PO43-?
How many equivalents are present in 0.5 mol of PO43-?
What is the concentration unit used to express the amount of ions in body fluids?
What is the concentration unit used to express the amount of ions in body fluids?
How many milliequivalents are there in 1 equivalent?
How many milliequivalents are there in 1 equivalent?
What is the number of positive ions always equal to in a neutral solution?
What is the number of positive ions always equal to in a neutral solution?
How many moles of magnesium ion are in 0.4 L of blood with a magnesium level of 16.0 mEq/L?
How many moles of magnesium ion are in 0.4 L of blood with a magnesium level of 16.0 mEq/L?
What is the amount of calcium ion in 0.4 g of CaBr2?
What is the amount of calcium ion in 0.4 g of CaBr2?
What is the type of electrolyte that ionizes completely in solution?
What is the type of electrolyte that ionizes completely in solution?
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Study Notes
Concentration Units
- A 0.92% (w/v) NaCl solution is equivalent to 0.92 g NaCl per 100 mL of solution.
- To find the mass of NaCl in 250 mL of solution, use the conversion factor: 0.92 g NaCl / 100 mL solution.
Parts Per Million (ppm)
- ppm = (mass of solute (g) x 10^6) / mass of solution (g)
- ppm = (volume of solute (mL) x 10^6) / volume of solution (mL)
- Example: 0.0054 g of MgCl2 in 2000 g of solvent.
Molarity (M)
- Molarity is the number of moles of solute per liter of solution.
- M = moles of solute (mol) / liter of solution (L)
- Example: 20.0 g of NaOH in 250 mL of solution.
Weight/Volume Percent Concentration (w/v)%
- w/v% = (mass of solute (g) / volume of solution (mL)) x 100%
- Example: 5 g of acetic acid in 100 mL of solution is 5% w/v.
Volume/Volume Percent Concentration (v/v)%
- v/v% = (volume of solute (mL) / volume of solution (mL)) x 100%
- Example: 70 mL of 2-propanol in 100 mL of solution is 70% v/v.
Electrolytes
- Strong electrolytes: ionize completely in solution (e.g., NaCl → Na+ + Cl-)
- Weak electrolytes: ionize partially in solution (e.g., CH3COOH → H+ + CH3COO-)
Equivalents (Eq)
- Equivalent (Eq) is a unit used to express the amount of each ion in solution.
- Amount of ion in solution is determined by equivalent (Eq), which relates to its charge.
Milliequivalents (mEq)
- 1 Eq = 1000 mEq
- Concentration of ions in the body is determined by mEq/L.
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