Determine the mass of NaCl present needed to prepare 500mL of 4.0%m/v solution.
Please show me how to set up problem
500ml? then you need .04*500 grams of NaCl. I think that is 20 grams, check it.
To determine the mass of NaCl needed to prepare a 4.0% m/v (mass/volume) solution, you'll need to use the following formula:
Mass of solute = (Volume of solution * Percent concentration) / 100
In this case, the volume of the solution is given as 500 mL and the percent concentration is 4.0%.
Now let's substitute these values into the formula:
Mass of NaCl = (500 mL * 4.0%) / 100
First, convert the volume from milliliters to liters since the percent concentration is typically expressed as a decimal:
Mass of NaCl = (500 mL * 4.0%) / 100 = (500 mL * 0.04) / 100 = 20 mL / 100 = 0.2 L
Now, multiply the volume by the percent concentration to get the mass of NaCl:
Mass of NaCl = 0.2 L * 4.0% = 0.008 L
Finally, express the mass in grams by multiplying by the density of NaCl, which is approximately 2.16 g/mL:
Mass of NaCl = 0.008 L * 2.16 g/mL = 0.01728 g
Therefore, you would need approximately 0.01728 grams of NaCl to prepare a 500 mL solution with a 4.0% m/v concentration.
To determine the mass of NaCl needed to prepare a 4.0% m/v (mass/volume) solution in 500mL, we need to follow these steps:
Step 1: Convert the percentage to a decimal.
4.0% = 0.04 (since 4.0% = 4.0/100 = 0.04)
Step 2: Calculate the mass of NaCl in the solution.
Mass = Percentage * Volume
Mass = 0.04 * 500mL
Step 3: Convert the volume from milliliters to grams.
Since the density of water is approximately 1g/mL, we can assume the density of the solution is also 1g/mL.
Therefore, 500mL = 500g
Step 4: Substitute the values into the equation to find the mass.
Mass = 0.04 * 500g
Mass = 20g
Therefore, the mass of NaCl needed to prepare a 4.0% m/v solution in 500mL is 20 grams.