What are the units of molarity? 2. Define the following terms: a) end point b) e

Question

What are the units of molarity? 2. Define the following terms: a) end point b) equivalence point 3. How many moles of NaOH will react completely with 1.222 mol HCl? (use the chemical reaction shown at the beginning of the lab) 4. What is the molarity of a solution made by adding 1.300 g of NaOH to a 250-mL volumetric flask and diluting to the mark? Use correct significant figures and show-work. 5. What is the molarity of a solution made by adding 60.0 mL of 8M HNO_3 into a 500 mL volumetric flask and then filling the flask to the line with distilled water? Use correct significant figures and show work 6. If 24.95 mL of a 0.1025 M HCl solution is added to reach the endpoint of a titration, how many moles of HCl have been added? Show work.

Explanation / Answer

6) moles of HCl added = molarity*volume of solution in litres = 0.1025*0.02495 = 2.557*10-3

5) Since moles of HNO3 remains the same , therefore applying

M1*V1 = M2*V2 ; we get

8*60 = M2*500

or, final molarity,M2 = 0.96 M

4) Molar mass of NaOH = 40 g/mole

Thus, moles of NaOH in 1.3 g of it = mass/molar mass = 0.0325

Molarity = moles of NaOH/volume of solution in litres = 0.0325/0.25 = 0.13 M

3) NaOH + HCl ------> NaCl + H2O

As per the balanced reaction NaOH and HCl reacts in the molar ratio of 1:1

Thus, moles of NaOH required = moles of HCl present = 1.222

1) unit of molarity = moles of solute/Litres of solution

2) equivalence point is the point at which chemically equivalent quantities of acid and the base is mixed

end point is the final stage of a process or reaction.

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