This acid-base chart includes the K a value for reference along with the chemical's formula and the acid’s conjugate base. The acid and base chart is a reference table designed to make determining the strength of acids and bases simpler.

1. Strong acids are listed at the top left hand corner of the table and have Ka values >1 2. Acid with values less than one are considered weak. 3. The strong bases are listed at the bottom right of the table and get weaker as we move to the top of the table.

Table of Acids with Ka and pKa Values* CLAS * Compiled from Appendix 5 Chem 1A, B, C Lab Manual and Zumdahl 6th Ed. The pKa values for organic acids can be found in Appendix II of Bruice 5th Ed.

Acid Ionization Constants at 25 °C. Acid Formula K a. Acetic acid HC 2 H 3 O 2 1.8×10 –5 Acrylic acid HC 3 H 3 O 2 5.5×10 –5 Aluminum 3+ ion Al 3+ (aq) 1.4×10 –5 Ammonium ion NH 4 + 5.6×10 –10 Anilinium ion C 6 H 5 NH 3 + 1.4×10 –5 Arsenic acid H 3 AsO 4 6.0×10 –3 H 2 AsO 4 – 1.0×10 –7. HAsO 4 2– 3.2×10 –12. Arsenous acid H 3 AsO 3 6.6×10 –10 Ascorbic acid H 2 …

This is “Appendix C: Dissociation Constants and pKa Values for Acids at 25°C”, appendix 3 from the book Principles of General Chemistry (v. 1.0). For details on it (including licensing), click here.

Note: A K a of "very large" indicates a strong acid.

Hydrogen sulfide H2S 8.9 x 10 –8 1.0 x 10 –19 Hypobromous HBrO 2.8 x 10 –9 Hypochlorous HClO 4.0 x 10 –8 Hypoiodous HIO 3.2 x 10 –11 Iodic HIO3 1.7 x 10 –1 Lactic HC3H5O3 8.3 x 10 –4 Maleic H2C4H4O5 1.5 x 10 –2 8.5 x 10 –7 Malonic H2C3H2O4 1.5 x 10 –3 2.0 x 10 –6 Nitrous HNO2 5.6 x 10 –4

May 21, 2024 · Calculate the Ka & p Ka of the acid. Answer: Step 1: Write down the equation for the partial dissociation of ethanoic acid. Step 2: Write down the equilibrium expression to find Ka. Step 3: Simplify the expression. The ratio of H + to CH 3 COO - is 1:1. The concentration of H + and CH 3 COO - is, therefore, the same.

Based on the K a values, HCl is the strongest acid followed by HNO 2, and then CH 3 CO 2 H. HCl has the smallest pKa, while the weakest among these, the acetic acid has the largest pK a value. So, remember this trait – stronger acids have lower p K a.

Equilibrium Constant (Ka): The acid dissociation constant, Ka, measures the strength of a weak acid. Definition: Completely dissociate in water. Examples: Sodium hydroxide (NaOH), potassium hydroxide (KOH). Definition: Partially ionize in water. Examples: Ammonia (NH 3), …