for a lab it says prepare a 300 ml of .2% sodium bicarbonate solution. I am trying to find how many grams of NaHCO3 i need. so i did 300ml X .002 and got .6ml of NaHCO3. but how do I convert that to grams of NaHCO3

Density=mass/volume, solve for mass

Density of NaHCO3=2.20 g/mL

1.32 g

To convert milliliters (ml) to grams (g), you need to know the density of the substance you are working with. In the case of sodium bicarbonate (NaHCO3), we can assume it has a density of 1 g/ml (which is a close approximation for water-based solutions).

So, to convert 0.6 ml of NaHCO3 to grams, you can simply multiply it by the density:

0.6 ml x 1 g/ml = 0.6 grams

Therefore, you would need 0.6 grams of NaHCO3 to prepare a 300 ml solution of 0.2% sodium bicarbonate.

To convert the volume of a solution to the mass of a solute, you need to know the density of the solute. In this case, the solute is sodium bicarbonate (NaHCO3). The density of NaHCO3 is approximately 2.20 grams per milliliter.

To calculate the mass of NaHCO3 required to prepare the 300mL of a 0.2% sodium bicarbonate solution, you can follow these steps:

Step 1: Calculate the volume of NaHCO3 needed in milliliters:
Volume of NaHCO3 (mL) = Volume of Solution (mL) × Percentage Concentration

Given that the volume of solution is 300 mL and the percentage concentration is 0.2%, the equation becomes:
Volume of NaHCO3 (mL) = 300 mL × 0.002
Volume of NaHCO3 (mL) = 0.6 mL

Step 2: Convert the volume of NaHCO3 to mass (grams) using the density:
Mass of NaHCO3 (g) = Volume of NaHCO3 (mL) × Density of NaHCO3 (g/mL)

Using the density of NaHCO3 as 2.20 g/mL, the equation becomes:
Mass of NaHCO3 (g) = 0.6 mL × 2.20 g/mL
Mass of NaHCO3 (g) = 1.32 g

Therefore, you need approximately 1.32 grams of NaHCO3 to prepare a 300 mL solution with a concentration of 0.2% sodium bicarbonate.