Consider the buffer system of carbonic acid (H₂CO₂) and its salt, KHCO3, which provides the conjugate base, HCO,. H,COoạ) + H_OW = HyO" log) + HCO, loa) How does the buffer react when some base is added? The bicarbonate ion (HCO) of the buffer reacts with the base. OHCO and H₂CO, both react with the base. O The buffer does not react O The carbonic acid (H₂CO₂) of the buffer reacts with the base Question 15 Indicate whether each of the following reactions is an example of reaction of an acid with a metal, reaction of an acid with a carbonate, or acid-base neutralization reaction using the dropdown on the right. Reaction A: ZnCO,(s) + 2HBr(aq) → ZnBr₂(aq) + CO₂(g) + H₂O(l) Reaction B: Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) Reaction C: HCI(g) + NaHCO3(s)→ NaCl(aq) + CO₂(g) + H₂O(0) Reaction D H₂SO4(aq) + Mg(OH)₂(s)→ MgSO₂(aq) + 2H₂000 3LIOH(aq) + H₂PO₂(aq) → L₂PO₂(g) + 3H₂000) Reaction E Reaction E Ca(s) + H₂SO4(aq) → H₂(g) + CaSO₂(aq)

a 1L solution contains 0.1M  acid HF and 0.1M salt NaF. the acid dissociation constant is 7.2 *10^-4. Find Ph and what is the ph when 0.05 moles NaOH is added?

Calculate the pH of a buffer solution prepared by dissolving 0,48 mole of sodium fluoride (NaF) and 1.0 mole of hydrofluoric acid (HF) in enough water to make 1.0 liter of solution. [K(HF) = 6,8 x 1o-j Your answer should have 2 sig figs

1. ACID-BASE TITRATIONS Four solutions of unknown HCI concentration are titrated with solutions of NaOH. The following table lists the volume of each unknown HCl solution, the volume of NaOH solution required to reach the equivalence point, and the concentration of each NaOH solution. Calculate the concentration (in M) of the unknown HCl solution in each case. HCI Volume (mL) NaOH Volume (mL) [NAOH] (M) (a) 25.00 mL 28.44 mL 0.1231 M (b) 15.00 mL 21.22 mL 0.0972 M (c) 20.00 mL 14.88 mL 0.1178 M (d) 5.00 mL 6.88 mL 0.1325 M