Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium chloride in enough water to make 300.0 mL of solution. Okay the answer is 5.00%....however I keep getting 0.0500%....Why? and which one is the correct answer? Thanks for your help! :)
Go back and look at my answer. I showed it by steps. You are dividing 5/100 to get 0.05 but that isn't the definition. 5% w/v means 5 g/100 so in 300 mL you would have 15.0 grams.
Ah, the great sodium chloride concentration conundrum! Fear not, my friend, for I am here to shed some light on this peculiar situation.
The answer to your question lies in the units of measurement used. In this case, the concentration is expressed as a percentage by weight/volume (% W/V). The numerator represents the weight (in this case, grams) of the solute (sodium chloride), and the denominator represents the volume of the solution (in this case, milliliters).
To find the correct answer, we divide the weight of the solute (15.0 g) by the volume of the solution (300.0 mL):
(15.0 g / 300.0 mL) × 100% = 5.00% (rounded to two decimal places)
So, the correct answer is indeed 5.00% W/V. Your initial result of 0.0500% arose from a simple decimal error. But hey, it happens! It's always good to double-check those calculations, especially when dealing with concentration levels. Keep up the great work and keep those solutions just salty enough!
To calculate the concentration (% W/V) of NaCl solution, you need to divide the mass of the solute (NaCl) by the volume of the solution and multiply by 100.
Given:
Mass of NaCl = 15.0 g
Volume of solution = 300.0 mL
To convert mL to L, divide the volume by 1000:
Volume of solution = 300.0 mL / 1000 = 0.300 L
The concentration (% W/V) formula is:
(% W/V) = (mass of solute / volume of solution) * 100
Plugging in the values:
(% W/V) = (15.0 g / 0.300 L) * 100
Calculating the value:
(% W/V) = 50.0%
Therefore, the correct answer is 50.0% w/v (not 5.00% or 0.0500%). There may have been an error in your calculations or unit conversions.
To calculate the mass/volume percent concentration (% w/v) of a NaCl solution, you need to divide the mass of the solute (NaCl) by the volume of the solution (water + NaCl solution) and multiply by 100. Here's how to calculate it correctly:
1. First, convert the mass of sodium chloride from grams to kilograms since % w/v is calculated in terms of mass/volume ratio. In this case, 15.0 g = 0.015 kg.
2. Next, calculate the volume of the solution by converting 300.0 mL to liters. 300.0 mL = 0.300 L.
3. Now, divide the mass of NaCl by the volume of the solution and multiply by 100 to get the percent concentration:
% w/v = (0.015 kg / 0.300 L) x 100
% w/v = 5.00%
Therefore, the correct answer is indeed 5.00% w/v.
Regarding why you calculated 0.0500% w/v, it seems like there might have been an error while performing the calculation. Double-check your calculations to ensure you divided the mass by the volume correctly and multiplied by 100.