How do you find the concentration of dots in a grid in unitss of dots/cm^2? Give

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How do you find the concentration of dots in a grid in unitss of dots/cm^2?

Give the concentrations in units of of mg/ml for the following solutions: 50g/liter 0.5g/ml 5mg/ml 500mg/liter show work

If you mixed 265 g of sugar with water to get a final volume of 725 ml, what is the concentration of this solution in g/L? show work.

If you took 1 ml of this solution, what would the concentration be? Explain reasoning.

You prepare a stock solution (highly concentrated) of sugar in water whose concentration is 500g/L. You need to make a new solution that is half (1/2) as concentrated and has a final volume of 100ml. Describe how you would make this dilution.

Step one: Your new solution has a concentration of _________

Step two: To make 100 ml of this new solution, you will need to add _____ of concentrated stock solution plus _____ of water.

Now make a second solution that is 1/10 as concentrated as the initial stock solution and has a final volume 100 ml. Describe how you make this dilution. Use the same "steps" as before.

Explanation / Answer

ans. a. If I mix 265 grams of sugar in 725 ml, we would get :

265 / 725 /1000 or

265/0.725 = 365.51 grams/litre

1ml of this solution would have the same concentration as the rest of the solution that is, 365.5 grams per litre because the concentration per litre would only change further if we increase the amount of sugar or add more water in this solution.

ans. b. if the solution is 500 grams per litre, and we want to half the concentration, then it would be 250 grams per litre that has the final volume of 100 ml so we use the formula:

c1v1 = c2v2

500 x v1 = 250 x 100

v1 = 250,00/500

v1 = 50

therefore, we would take 50 ml of the 500 gram/litre solution and add 50 ml water to it to make final volume 100 ml.

Your new solution has a concentration of __250 grams per litre _______

Step two: To make 100 ml of this new solution, you will need to add _50ml____ of concentrated stock solution plus _____ of water.

now, if we want to make 1/10 of concentration, that means 50 grams per litre.

so c1v1 = c2v2

500 x v1 = 50 x 100

v1 = 5000/500

v1 = 10 ml

therefore we would take 10ml of stock solution and add 90 ml of water to it.

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