What volume of a 0.240 m solution of barium nitrate is needed to prepare 0.500 l a solution that is 0.0800 m in nitrate ion?
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Answer : Option E) 50 grams.
Explanation : According to the solubility curves the compound to dissolve at 50 °C in 100 mL of water will need 50 grams of the compound. It is clearly indicated in the graph which is marked with red that at 50°C approximately 50.4 grams of the compound
will be needed to dissolved in 100 mL of water to form a solution.
Answer:- The pH of the buffer solution will be 4.04 .
Solution:- Sodium acetate added to acetic acid makes a buffer solution and the pH of buffer solution is easily calculated by using Handerson equation:
We are adding 25.00 mL of each, so the total volume of the buffer solution will be 50.00 mL.
We can calculate the concentration of base which is sodium acetate and acid by using dilution equation:
for base:
Similarly, for acid:
pKa is calculated from given Ka value as:
pKa = 4.74
Let's plug in the values in Handerson equation:
pH = 4.74 - 0.70
pH = 4.04