Tamara asked in Science & MathematicsChemistry · 2 months ago

# If 0.53g of pure anhydrous sodium carbonate is dissolved in water to make 200cm^3 of solution  . What is the concentration of the solution .?

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• 2 months ago

Concentration ....

You can express "concentration" in a number of units, and you don't specify which:

g / mL or g / cm³ ...... using 1 mL = 1 cm³

g / 100 mL ... solubility

mol / L ... molarity

mol / kg of water ..... molality

In chemistry, molarity is probably the most common single concentration unit:

0.53g Na2CO3 x (1 mol Na2CO3 / 105.99g Na2CO3) / 0.200L = 0.025 mol Na2CO3 / 1 L ... or ... 0.025M

Since the precision of "200 mL" is ambiguous, and 0.53g is expressed to two significant digits, the answer can be no more precise than two significant digits.

• Anonymous
2 months ago

It's a simple division unless you need a specific set of units which you didn't specify.

• 2 months ago

that is 105.9888 g/mol, call it 106.

0.53 g / 106 g/mol = 0.005 mol200 cm³ = 200 mL = 0.2 Lmolar concentration is number of moles per liter0.005 mol / 0.2 L = 0.025 mol/L = 0.025 M