Question

1.For all salt solutions that have pH less than 6 or greater than 8 write the equation which shows the anion reacting with water to produce H3O+ or OH- as a product. Make sure your equation is balanced.

nousius a) Measurement of the pH of some typical solutions. Using a 25 mL sample in a 150 ml beaker, measure and record the pH of 0.1 M solution of each of the following substances using pH test paper: neutral pasic neutral audiobobbsajlOHO OSV and Naci, Na2CO3, NaCH3CO2, NaHSO4 -7 512 = 7 Some of the solutions are nearly neutral, others acidic or basic. For each solution having a pH greater than 8, OH must be produced from the interaction of the anion with water. For each solution having a pH less than 6, H3O* must be produced from the interaction of the anion with water. som nisos bo OH MOTO b) Properties of Buffers bios si to Soninio sutximistlus On the lab bench you will have 0.10 M stock solution that can be used to make three different common buffer systems. These are an Hoon 110W HO CH3CO2H, CH3CO2 v ni bevoado UV geolo VELG non de lat ner som don el bolela svar UOVS HO U SE N114,713 Teru ni mud SU 101 bsson Tol Bule DSVS or ons. Ho berieb o dstota ar mot DOUBUDE HCO3, CO3 Gods Woolo Isasd OJSOU NOODOO 01151 Have your instructor assigns you ONE of the systems above to work with

Answer 1

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The salt solution having pH value greater than 8 is Sodium carbonate (Na₂CO₃ ) pH value = 12 pH = 12, it is basic in nature Reaction with water First Naz CO₂ gets dissociated into ions Narcos = 2 Nat + CO2- Noul anion cor reacts with water to form of ions. Cor + H₂O - HCOo + oH Also HCO + H₂O → H₂CO₃ + OH TCO 2 + 2H2O → H₂CO₃ + 2017 (overall anion - reaction) The salt solution having pH value less than 6 is Na H SO 1.

Sodium bisulphate, pH value = 1 . - pH = 1, it is highly acidic in nature. Reaction with water First NaHsou gets dissociated in to its constituent ions. NaHSO4 = Nat + H SO Now, anion H.Sou react with water to form H₂otions. THSO4 + H₂O - H₃O+ + 50
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