1) The pH of a 0.10 M HCN solution is 5.2.
Explain what is [CN-] and What is [HCN](Where do H+ and CN- ions come from?)
Explain What is the value of Ka for HCN?
2) Formic acid, HF or has a Ka value equal to about 1.8*10~-4. A student is inquired to prepare a buffer having a pH of 3.4 from a solution of formic acid as well as a solution of sodium formate having the same molarity. Explain how many milliliters of the NaFor solution must she add to 20 ml of the HF or solution to make the buffer?
3) Explain how many mL of 0.10 M NaOH the student should add to 20 ml 0.10 M HF or if she wished to prepare a buffer with a pH of 3.4
Explain a solution of Na2CO3 has a pH of 10. The CO3 2- ion is the conjugate base of the HCO3 - ion. State the net ionic equation for the reaction which makes a solution of Na2Co3 basic.