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How do I know if a solution is acidic, basic, or neutral? KCN which comes from a strong base (KOH) and a weak acid (HCN) pH is basic (7) NaClO which comes from a strong base (NaOH) and a weak acid (HClO) pH is basic (>7) To determine which is most basic among the three (LiNO2, KCN and NaClO) one must compare the Kb of the conjugate base and that will dictate the level of alkalinity
Chemistry Help Please! | Wyzant Ask An Expert Chemistry Help Please!Calculate the pH of a buffer solution that is 0 250 M in HCN and 0 170 M in KCN For HCN, Ka = 4 9 × 10^–10 (pKa = 9 31) Use both the equilibrium approach and the Henderson–Hasselbalch approach
What mass of KCN should the student dissolve in the HCN solution A chemistry graduate student is given 125 mL of a 0 90M hydrocyanic acid (HCN) solution Hydrocyanic acid is a weak acid with K, = 4 9 x 10 -10 What mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8 86? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it Be sure your answer has a unit symbol, and round
What is the pH of a 0. 810 M solution of NaCN (Ka of HCN is 4. 9 × 10⁻¹⁰)? When given a salt, and asked to find the pH, you must look at the hydrolysis of the salt Since NaCN is the salt formed from a weak acid (HCN) and a strong base (NaOH), the pH of the salt solution will be basic (>7) Hydrolysis: CN - + H2O ==> HCN + OH - Here, CN - is acting as a base, so we use the Kb for CN - Kb = 1x10 -14 Ka = 1x10 -14 4 9x10 -9 = 2 04x10 -6 Kb = 2 04x10 -6 = [HCN] [OH