Brad is testing three solutions with litmus paper. After dipping the litmus paper strips in the solutions, he observes two paper
2 answers:
Answer: one solution is acidic
Explanation:
Acid base indicators are usually weak acids or weak bases. They change their color in the solution with change in the pH.
For any indicator say HIn , the dissociation can be shown as:
Litmus is one such indicator which turns red in acidic solutions, blue in alkaline solutions, and purple in neutral solutions.
Thus out of three solutions , the litmus paper strip is turning red in one solution, thus only one solution is acidic. the other two in which litmus is showing blue color are alkaline in nature.
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Answer:
3.6
Explanation:
Step 1: Given data
- Concentration of formic acid: 0.03 M
- Concentration of formate ion: 0.02 M
- Acid dissociation constant (Ka): 1.8 × 10⁻⁴
Step 2: Calculate the pH
We have a buffer system formed by a weak acid (HCOOH) and its conjugate base (HCOO⁻). We can calculate the pH using the <em>Henderson-Hasselbach equation</em>.