Calculate the concentration of a solution B containing 10.6g have f Na2CO3 per dm³

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mols Na2CO3 = 10.6/106 = 0.1 mol

That's in 1 dm^3 so the concentration is 0.1 mol/dm^3

To calculate the concentration of a solution, you need to know the amount of solute (in this case, Na2CO3) and the volume of the solvent (in this case, in dm³).

Given that solution B contains 10.6g of Na2CO3 per dm³, we can use this information to calculate the concentration.

The formula for concentration is:

Concentration (C) = Amount of Solute / Volume of Solvent

In this case, the amount of solute is 10.6g of Na2CO3, and the volume of solvent is 1 dm³.

Substitute the values into the formula:

C = 10.6g / 1 dm³

So, the concentration of solution B is 10.6 g/dm³.