b. What is the molarity of a solution 500 mL of which contains 0.500 moles of HC
ID: 693464 • Letter: B
Question
b. What is the molarity of a solution 500 mL of which contains 0.500 moles of HC!? 2. 80.0 g of NaOH is dissolved to make 5.00 liters of solution. What is the concentration of this solution in moles/liter (i.e., its molarity)? 3. a. Washing down the sides of the flask with water during the titration produces which of the following effects: (a) a high result b) a low result(c) no effect b. A student delivers about 20 mL of solution from a buret in the titration. The percentage uncertainty in the measurements if she reads the buret to the nearest 0.02 mL is: (a) 1% (b) 0.1 % (c) 0.5% (Show calculation) 4. 24.60 mL of 0.185 M HNO, are titrated with 27.35 mL of a KOH solution. What is the molarity of the KOH? 5. The results of a titration show that 20.34 mL of 0.1003 M oxalic acid (H,C,O) solution exactly neutralize 25.00 mL of a sodium hydroxide solution. What is the molarity of the NaOH solution? (Hint: Write the chemical equation for the reaction first. Both hydrogens in H,C2O, are neutralized.)Explanation / Answer
1b) molarity=no of moles/volume in litres
molarity= 0.500/0.500= 1 M
2)no of moles=given weight/molecular weight
no of moles=80/40= 2
Molarity=2/5= 0.4M
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