Question

you. 12e) phenolphthalein (color change between pH-8-10), bromocresol green color change between pH 3-4) are provided to pH change at point of Proposed indicator inflection titration between HCl and 1 to 11 NaOH 12d) Calculate the pH of the solution when 10 mL of 0.1 M NaOH is added to 25 mL 0.1 M HCI .Write appropriate chemical equations if required and show your math!!!(4 points) In the ICE table started for calculating equilibrium concentrations of the reaction shown, the terms in the "change" column are MLA L M2+ +4L [M I 0.10 M CX 0.32 M IMLI OM +X x, x, x B 2) Which two mean the same thing? acid and base H(aq) and H30'(aq) d. proton and hydrogen atom base and proton donor 3) Bases accept protons or hydronium ions in aqueous solutions. The equilibrium constant kb describes the following reaction for a weak base, B, in aqueous solution: a B+ H BH c. B+H20BH + OH B+H30 BH + H20 d B+OHBH +02- b. 4) Weak and strong acids and bases can be compared with people and their money (protons). Which best corresponds to a rich generous person? HCI NH3 Nazo HNO2

Answer 1

129 Titration between Hu xnaoh by change at point of inflection I toll Proposed indicator Phenolphthalein As penolphthalein is colourless in acidic solution puc7 and pinkin basic solutim pn >7 so for this tirratim inflection is also in basic end point medium ph-ft-pro77 so phenophthallin should used. 12 4: Naoh lap.) + HC lapi) + Nace lapi) +42011) mol of Naoh molarity x volume (L) added = = ml = 0.00)L) loml= 0.01) 0.1 mol x 0.05% = 0.00) mol mol of He present = ·025% = 0.0025 mol

From Balanced reaction I mol of Naoh react with Imol Hel 0.002 mol g Naou react with oool mol He moly nice available = 0.0025 mol molguc react = 0.001 moll moly Halet = 0.0025 mol - 0.001 mol = 0.0015 Total volume = 0.01L+ 0.025% = 0.035 concentration J HU = mol lett = 0.001s = 0.04285M Totarolume 0.035 Прия — од си*) = -log [orous] bu = 1:37 . bu og solution = 1:37 Answer