Concentration Questions

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Problem 1: 

How much Na2Cr2O7 would I need to make 250mL of 0.05M solution? 

Problem 2: 

How much of the solution could I make if I had only 2.5g of Na2Cr2O7?

Problem 3:

Calculate the concentration of the following solutions:

    1. 1.5 mole of C2H5OH in 4.80 L of solution
    2. 0.4 mole of H2SO4 in 340ml of solution
    3. 12.5g of CH3OH in 2.7 L of solution
    4. 0.373g of KCl in 55ml of solution
    5. 19.7g of magnesium chloride in 500ml of solution
    6. 342g of iron (II) sulphate in 1380ml of solution
    7. 21g of calcium nitrate in 200ml of solution

     

Problem 4:

Calculate the number of moles of solute in the following solutions:

    1. 3.2 L of 0.1 M sodium oxalate, Na2C2O4
    2. 450ml or 2.3 M HCl
    3. 15ml of 0.0025 M NaOH
    4. 10 L of 0.43 M sodium chloride
    5. 25ml of 0.003 M potassium dichromate

     

Problem 5:

Calculate the number of grams of solute needed to prepare:

    1. 5.5 L of 6.0 M NaCl
    2. 250ml of 1.2 M HCl
    3. 550ml of 0.25 M K2Cr2O7
    4. 1250ml or 3.0 M sulfuric acid
    5. 10ml of 0.004 M ammonium hydroxide

 

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