If 45g of a 2.2% NaHCo3 solution is to be prepared how many grams of NaHCo3 are needed
Is that mass percent? 2.2% means 2.2g NaHCO3/100 g solution. You want only 45g; therefore,
2.2 x (45/100) = ?
To determine the number of grams of NaHCo3 needed to prepare a 45g solution of 2.2% NaHCo3, we need to use the formula:
mass of solute = (mass of solution) × (percent concentration/100)
In this case, the mass of solute (NaHCo3) is what we want to find. The mass of the solution is given as 45g, and the percent concentration is 2.2%.
Let's substitute the values into the formula:
mass of solute = (45g) × (2.2/100)
To calculate this, we need to divide 2.2 by 100 and multiply the result by 45:
mass of solute = (45g) × (0.022)
Now, multiply 45g by 0.022:
mass of solute = 0.99g
Therefore, approximately 0.99 grams of NaHCo3 are needed to prepare a 45g solution of 2.2% NaHCo3.