Quiz 3/18/05 1) For the titration of 100 mL of 0.15 M HCl with 0.1 M NaOH, fill in the table. 2) Why does adding water to a buffer solution not change the pH?
Give the identity and concentration of the titrated sample (50 mL) represented by the blue line.
Problem 98 • Describe the effect on the pH of • Adding sodium acetate to 0.1 M acetic acid • Adding NaNO3 to 0.1 M HNO3 • Why are the effects not the same?
In lab, you titrate a 25-mL sample of HCN with 0.075 M NaOH. If it takes 37.5 mL to reach the equivalence point, what is the concentration of the HCN?
Which of these combinations would be the best to buffer the pH at approximately 9? • CH3COOH (Ka = 1.8 x 10-5) / NaCH3COO • HCl (Ka = very large) / HCl • NH3 (Kb = 1.8 x 10-5) / NH4+
Each of the solutions given in the table has an equal volume and the same concentration (0.1 M) Which solution requires the greatest volume of 0.1 M NaOH to titrate? Explain.
The solubility of Ca(OH)2 is 7.9 x 10-6. What is the pH of a saturated solution of calcium hydroxide?
A 25-mL sample of 0.085 M pyridine (Kb = 1.5 x 10-9) is titrated with 0.102 M HCl. What is the pH when 5.5 mL of the acid has been added?