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The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g of CoCl2 (molar mass 130.g/mol ) in enough water to make 100.mL of solution. What is the molar concentration of the solution?

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dsdrajlin

Answer:

0.200 M

Explanation:

Step 1: Given data

  • Mass of CoClâ‚‚ (m): 2.60 g
  • Molar mass of CoClâ‚‚ (M): 130 g/mol
  • Volume of solution (V): 100 mL

Step 2: Calculate the moles (n) of CoClâ‚‚ (solute)

We will use the following expression.

n = m/M

n = 2.60 g/(130 g/mol)

n = 0.0200 mol

Step 3: Convert "V" to liters

We will use the conversion factor 1 L = 1000 mL.

100 mL × 1 L/1000 mL = 0.100 L

Step 4: Calculate the molarity of CoClâ‚‚

We will use the definition of molarity.

[CoClâ‚‚] = n/V(L)

[CoClâ‚‚] = 0.0200 mol/0.100 L

[CoClâ‚‚] = 0.200 M

pstnonsonjoku

The molar concentration of the solution is 0.2 M.

First, we must calculate the number of moles of CoCl2 as follows;

Number of moles = mass/molar mass

mass = 2.60g

Molar mass =  130.g/mol

Number of moles = 2.60g/ 130.g/mol = 0.02 moles

Molarity of solution = Number of moles/volume of solution in liters

Volume of solution = 100.mL or 0.1 L

Molarity of solution = 0.02 moles/0.1 L

Molarity of solution = 0.2 M

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