Which is the weaker acid
H3PO4 or H2S
H2S is the weaker acid compared to H3PO4.
To determine which is the weaker acid between H3PO4 (phosphoric acid) and H2S (hydrogen sulfide), we can compare their acid dissociation constants (Ka) or pKa values. A lower Ka or higher pKa value indicates a weaker acid.
The pKa value of H3PO4 is approximately 2.12. On the other hand, the pKa value of H2S is around 7. This implies that H2S is a weaker acid compared to H3PO4 because it has a higher pKa value.
Therefore, H2S is the weaker acid compared to H3PO4.
To determine which acid is weaker, we need to compare their acid dissociation constants (Ka) or pKa values. The higher the Ka or the lower the pKa, the stronger the acid is.
To compare the strengths of H3PO4 (phosphoric acid) and H2S (hydrogen sulfide), we can examine their pKa values.
The pKa value of phosphoric acid (H3PO4) is 2.12, while the pKa value of hydrogen sulfide (H2S) is 7.04.
Since the pKa of H3PO4 is lower than that of H2S, we can conclude that H3PO4 is the stronger acid, and H2S is the weaker acid.
Here's how you can find this information:
1. First, determine the chemical formula for each acid. H3PO4 is phosphoric acid, and H2S is hydrogen sulfide.
2. Look up the dissociation constants (Ka) or pKa values for phosphoric acid (H3PO4) and hydrogen sulfide (H2S). These values can be found in chemistry reference books, online databases, or computational tools.
3. Compare the pKa values of the two acids. The lower the pKa, the stronger the acid.
Remember, pKa is just one way to compare acid strength. Other factors, such as the nature of the acid and its molecular structure, can also contribute to its acidity.