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6 Jun 2018

Assuming the volume of water in a typical frog is 100 mL, calculate how many grams of NaCl (formula weight 58.44) the frog must take up to make its tissues isotonic with seawater.

Osmolarity of frog tissues = 235 mosmol / L
Osmolarity of seawater = 1120 mosmol / L
Answer = 2.6 g

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Jamar Ferry
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7 Jun 2018

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Related questions

A. Molar Solutions: A molar (M) solution is define as a mole of a compound dissolved in enough water to make exactly one liter of solution at 200 C. A mole is the molecular weight of a compound in grams (g), e.g. for sodium chloride, it is 22.99 g (atomic weight of sodium) + 35.46 g (atomic weight of chlorine) = 58.45 g. Dissolve 58.45 g of NaCl in 1 liter (1 L) of solution = 1 molar (M) solution. You could also make up the same molarity of NaCl by dissolving 5.845 g NaCl in 100 milliliter (mL) or 0.5845 g in 10 mL or 0.05845 g in 1 mL. To make up lesser concentrations, say 0.1 M, you would add 5.845 g NaCl in 1 liter (L) solution or 0.5845 in 100 mL or 0.05845 g in 10 mL or 0.005845 g. in 1 mL. The metric sytstem is also useful in solutions too: 1 molar (M) is the same as 1,000 millimolar (mM) or 1,000,000 micromolar (mircolitersM) or 1,000,000,000 nanomolar (nM). Answer the following questions on a separate piece of paper for your lab report. Use correct scientific notation and significant figures:

6. Exercise: Explain how you would make 1000 mL of a 0.25 M solution containing sucrose (C12H22O11 ).

7: Explain how you would make up 200 mL of 0.25 M solution containing glucose using solid sucrose and distilled water,

8. Explain how you would make up 200 mL of 0.025 M solution containing glucose using solid sucrose and distilled water.

9. What is the concentration in 8 expressed as mM?

10. What is the concentration in 8 expressed as microlitersM?

11. What is the concentration in 8 expressed as nM?

A. you want to make 406 mL of a solution with a concentration of 350 g/L. how much solute (in g) will you need? (answer rounded to 1 decimal place)

B. you want to make 52 mL of a solution with a final concentration of 388 mg/mL. how much solute (in g) will you need? (answer rounded to 1 decimal place)

C. you mix 28 mL of a 288 g/L stock solution with 541 mL of water. What is your final concentration in g/L? (answer rounded to 1 decimal place)

D. you bring 33 mL of a 595 g/L stock solution up to a final volume of 203 mL with water. What is your final concentration in g/L? (answer rounded to 1 decimal place)

E. you have a stock solution with a concnetration of 749 g/L you want to make 1L of solution with a concentraion of 83 g/L how many mL of stock solution should you mix to bring the final volume up to 1L

1- Calculate the number of grams needed to make 1 mL of a 1M solution of the oligonucleotide (32nt)

2- You have a 300 μM solution of a primer (45nt) in a volume of 400μL, how many μg of primer do you have total?

3- You received a primer (25nt) which came to you as a powder with a mass of 0.31 mg

a- what concentration of primer do you have when you add 100μL water?

b- How would you make a 5 pmol/μL solution with a total of 100 μL?

PLEASE HELP!

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