http://www.ck12.org Chapter 21. Acids and Bases
a. strong acid-weak base
b. weak acid-strong base
c. strong acid-strong base- A certain titration has its end point at pH = 5. Choose an appropriate indicator for this titration.
- For the indicator phenol red, what is the color of HInd? What is the color of Ind−?
Problems
- Finish and balance the following molecular equations.
a. HBr(aq)+Al(OH) 3 (aq)→
b. H 2 SO 4 (aq)+LiOH(aq)→
c. H 3 PO 4 (aq)+Sr(OH) 2 (aq)→ - Write balanced net ionic equations for the neutralizations below. Assume aqueous solutions unless indicated
otherwise.
a. Hydrochloric acid + potassium hydroxide
b. Hydrocyanic acid (weak acid) + potassium hydroxide
c. Nitric acid (strong acid) + solid sodium hydroxide
d. Carbonic acid (weak acid) + ammonia (weak base) - What is the molarity of a sodium hydroxide solution if 20.00 mL of it is fully neutralized by each of the
following solutions?
a. 10.00 mL of 0.500 M HCl
b. 10.00 mL of 0.500 M H 2 SO 4
c. 10.00 mL of 0.500 M H 3 PO 4 - What is the molarity of a solution of phosphoric acid (H 3 PO 4 ) if 34.27 mL of it is neutralized in a titration by
28.85 mL of 0.350 M barium hydroxide (Ba(OH) 2 )? - 15.52 g of sodium hydroxide is dissolved into enough water to make 1.00 L of solution. Then, 25.00 mL of
this solution is titrated against a solution of CH 3 COOH. If the endpoint is reached after adding 18.05 mL of
the CH 3 COOH solution, what is the molarity of the acid?
Further Reading / Supplemental Links
- Neutralization, http://www.kentchemistry.com/links/AcidsBases/Neutralization.htm
- AcidBaseTitrations, http://www.kentchemistry.com/links/AcidsBases/titration.htm
- pH(Titration)Curves, http://www.chemguide.co.uk/physical/acidbaseeqia/phcurves.html
- Acid-BaseIndicators, http://www.chemguide.co.uk/physical/acidbaseeqia/indicators.html
Points to Consider
Salt solution can be acidic, basic, or neutral.
- How can the acidity or basicity of a salt solution be determined?
- What is a hydrolysis reaction, and how does it affect the pH?