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Course: Biology archive > Unit 2. Lesson 4: Acids, bases, and pH. Autoionization of water. Arrhenius acids and bases. Brønsted–Lowry acids and bases. Definition of pH.
Unit 8: Acids, bases, and solutions Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501(c)(3) nonprofit organization.
Course: Biology archive > Unit 2. Lesson 4: Acids, bases, and pH. Autoionization of water. Arrhenius acids and bases. Brønsted–Lowry acids and bases. Definition of pH.
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Acid-base reactions: Arrhenius acid + Arrhenius base = water + salt When an Arrhenius acid reacts with an Arrhenius base, the products are usually water plus a salt. These reactions are also sometimes called neutralization reactions .
The pH is less than seven for a weak base-strong acid titration. The reason why the pH is less than seven at the equivalence point is because all the ammonia that we started with has been completely neutralized and turned into the ammonium cation, NH4+.
Acid–base titrations. Worked example: Determining solute concentration by acid–base titration. Titration of a strong acid with a strong base. Titration of a strong acid with a strong base (continued) Titration of a weak acid with a strong 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.
A buffer is a solution composed of a conjugate acid-base pair that resists dramatic pH changes when introducing a base or an acid. So, while both are important in chemistry they serve different roles.
When a weak acid and a strong base are mixed, they react according to the following net-ionic equation: HA(aq) + OH⁻(aq) → A⁻(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 A⁻ with water.