Which curve shows the titration of a weak acid with a strong base?
The titration curve is a graph of the volume of titrant, or in our case the volume of strong base, plotted against the pH. There are several characteristics that are seen in all titration curves of a weak acid with a strong base.
How does the weak acid titration curve differ from the strong acid titration curve?
The general shape of the titration curve is the same, but the pH at the equivalence point is different. In a weak acid-strong base titration, the pH is greater than 7 at the equivalence point. In a strong acid-weak base titration, the pH is less than 7 at the equivalence point.
Can titrations be performed with a weak acid and a weak base?
If both are of equal strength, then the equivalence pH will be neutral. However, weak acids are not often titrated against weak bases because the colour change shown with the indicator is often quick, and therefore very difficult for the observer to see the change of colour.
How do you calculate concentration from a titration curve?
Divide the number of moles of analyte present by the original volume of the analyte. For example, if the original volume of the analyte was 500 mL, divide by 1000 mL per L to obtain 0.5 L. Divide 0.01 moles of analyte by 0.5 L to obtain 0.02 moles per liter. This is the concentration or molarity.
What happens when you mix a strong acid with a weak base?
When a weak base and a strong acid are mixed, they react according to the following net-ionic equation: B(aq) + H₃O⁺(aq) → HB⁺(aq) + H₂O(l). If the acid and base are equimolar, the pH of the resulting solution can be determined by considering the equilibrium reaction of HB⁺ with water.
Why is titration curve S shaped?
The titration of either a strong acid with a strong base or a strong base with a strong acid produces an S-shaped curve. The curve is somewhat asymmetrical because the steady increase in the volume of the solution during the titration causes the solution to become more dilute.
Why the titration curves for strong acids bases have a different shape than titrations of weak acids bases?
What happens when a strong acid and weak base react?
Is best indicator used in titration of weak acid and strong base?
Choice of Indicators
| Types of titration | Indicators |
|---|---|
| Strong acid-strong base | Phenolphthalein is usually preferred because of its more easily seen colour change. |
| Weak acid-strong base | Phenolphthalein is used and changes sharply at the equivalence point and would be a good choice. |
What happens if we mix a solution of a strong acid with a solution of a strong base?
When a strong acid and a strong base are mixed, they react according to the following net-ionic equation: H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l). If either the acid or the base is in excess, the pH of the resulting solution can be determined from the concentration of excess reactant.
What makes a weak acid weak?
Molecules that contain an ionizable proton. A molecule with a formula starting with H usually is an acid.
Why is H3PO4 a strong acid?
A very strong acid always forms a weak conjugate base.
What are some weak acids and bases?
– C 6 H 5 NH 2 (9.38) – NH 3 (4.75) – CH 3 NH 2 (3.36) – CH 3 CH 2 NH 2 (3.27)
Is pH a strong or weak acid?
pH is a measure of the concentration of hydrogen ions in a solution. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution. Defining pH Example: Working out the pH of a strong acid