How to Calculate Mole Concentration

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The mp concentration indicates the relationship between the mp number of a solute and the volume of the solution. To calculate the mp concentration, you can start with the number of mp and volume, mass and volume, or the number of mp and milliliters (ml). Then, with the above variables, apply the basic mp concentration formula to get the correct result.

Table of Contents

Calculate Mp Concentration from Mp Count and Volume

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It is necessary to know the basic formula to calculate the concentration of mp. The mp concentration is equal to the number of mps of a solute divided by the volume of the solution in liters. ^{[1] X Research Source} From there, we have the following formula: Concentration mp = number of mp of solute / number of liters of solution

Example: Find the concentration mp of a solution containing 0.75 mp of NaCl in 4.2 liters of solution?

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Analyze topics. To calculate the concentration in mp, you need the number of mp and the volume of the solution in liters. You do not need to calculate these two values because the problem is given.

For example:
- Number of mp = 0.75 mp NaCl
- Volume = 4.2 L

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Divide the number of mps by the volume. The result of dividing the number of mp by the volume is the number of mp per liter of solution, or the concentration mp of that solution.

Example: concentration mp = number of mp of solute / number of liters of solution = 0.75 mp / 4.2 L = 0.17857142

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Record results. Round to two or three decimal places, depending on the teacher’s or the assignment’s requirements. When you record your results, abbreviate “mp concentration” with “M” and include the chemical symbol for the solute.

Example: 0.179 M NaCl

Calculate Mp Concentration from Mass and Volume

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Need to know the basic formula to calculate the concentration of mp. The mp concentration represents the relationship between the mp number of a solute and the volume of solution. The formula to calculate the concentration mp is as follows: concentration mp = concentration of solute / number of liters of solution

Example problem: Calculate the number of mp of the solution when dissolving 3.4 g of _KMnO4 in 5.2 liters of water.

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Problem Analysis: To find the concentration of mp, you need the number of mp and the volume of the solution in liters. If these values are not given, but you know the volume and mass of the solution, you can determine the number of mp of solute before calculating the mp concentration.

For example:
- Mass = 3.4 g KMnO ₄
- Volume = 5.2 L

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Calculate the molar mass of the solute. To calculate mp of solute from that mass or grams of solute, you first need to determine the molar mass of the solute. The molecular mass of a solute can be determined by adding the atomic mass of each element present in the solution. To find the atomic mass of each element, use the periodic table of the chemical elements.

For example:
- Atomic mass of K = 39.1 g
- Atomic mass of Mn = 54.9 g
- Atomic mass of O = 16.0 g
- Total Atomic Mass = K + Mn + O + O + O + O = 39.1 + 54.9 + 16 + 16 + 16 + 16 = 158.0 g

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Convert grams to mp. Once you have the molar mass, you need to multiply the number of grams of solute in solution by the equivalent conversion factor of 1 mp per solute molar mass. The result of this multiplication is the number of mps of the solute.

Example: grams of solute * (1/molecular mass of solute) = 3.4 g * (1 mp / 158 g) = 0.0215 mp

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Divide the number of mp by the number of liters. You have calculated the number of mp, now divide that number of mp by the volume of the solution in liters, you will have the concentration in mp of that solution.

Example: concentration mp = number of mp of solute / number of liters of solution = 0.0215 mp / 5.2 L = 0.004134615

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Record the results. You need to round the result as required by the teacher, usually two to three decimal places. Also, when writing results, abbreviate “mp concentration” as “M” and include the chemical symbol for the solute.

Example: 0.004 M KMnO ₄

Calculate Mp Concentration from Number of mps and Milliliters of solution

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Need to know the formula to calculate the concentration mp. To calculate the concentration of mp. You need to calculate the mp of solute in a liter of solution, not milliliters of solution. The general formula to calculate mp concentration is: concentration mp = number of mp of solute / number of liters of solution

Example: Calculate the concentration mp of a solution containing 1.2 mp of CaCl ₂ in 2905 milliliters of water.

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Analyze topics. To calculate the mp concentration, you need the mp number of solute and the volume of the solution in liters. If the volume of the solution mentioned in the problem is in milliliters, you need to convert to the equivalent volume in liters before calculating.

For example:
- No. of mp = 1.2 mp CaCl ₂
- Volume = 2905 ml

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Convert milliliters to liters. ^{[2] X Research Source} To convert a solution from milliliters to liters, you divide the number of milliliters by 1000, because each liter equals 1000 milliliters. You can also convert milliliters to liters by shifting the decimal point 3 digits to the left.

Example: 2905 ml * (1 L / 1000 ml) = 2,905 L

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Divide the number of mp by the number of liters. Once you have the number of liters, you can calculate the concentration in mp by dividing the number of mp by the number of liters of the solution.

For example: concentration mp = number of mp of solute / number of liters of solution = 1.2 mp of CaCl ₂ / 2.905 L = 0.413080895

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Record results. Remember to round the result to two or three decimal places, or as requested by the teacher. When recording results, abbreviate “mp concentration” as “M” and then the chemical symbol for the solute.

Example: 0.413 M CaCl ₂

More Practice

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Calculate the concentration mp of a solution when 5.2 g of NaCl is dissolved in 800 ml of water. Determine the values given by the problem: mass in grams and volume in milliliters.

- Mass = 5.2 g NaCl
- Volume = 800 ml of water

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Find the molecular mass of NaCl by adding the atomic mass of the element Na, and the atomic mass of Cl.

Atomic mass of Na = 22.99 g
Atomic mass of Cl = 35.45 g
Molecular mass of NaCl = 22.99 + 35.45 = 58.44 g

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Multiply the mass of the solute by the conversion factor to mp. In this example, the molecular mass of NaCl is 58.44 g, so the conversion factor is “1 mp / 58.44 g”.

mpe NaCl = 5.2 g NaCl * (1 mp / 58.44 g) = 0.8898 mp = 0.09 mp

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Divide 800 ml of water by 1000, you get the volume of water in liters.

You can also take 800 ml multiplied by the milliliter to liter conversion factor of 1 L/1000 ml.
To shorten the multiplication and division process as above, you can move the decimal point 3 digits to the left.
Volume = 800 ml * (1 L / 1000 ml) = 800 ml / 1000 ml = 0.8 L

Steps

Calculate Mp Concentration from Mp Count and Volume

Calculate Mp Concentration from Mass and Volume

Calculate Mp Concentration from Number of mps and Milliliters of solution

More Practice

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