Question

1. Identify the Brönsted acid and base in the following reaction, and identify the conjugate base and acid formed. HSO3-(aq) + CH3NH3(aq) ------ H2SO3(aq) + CH3NH2(aq) 2. Write the formulae for the conjugate acids of: 1. a) C2042: the oxalate ion. 2.b) C6H5NH2, aniline. 3.c)NH2OH, hydroxylamine. (Use above question as a guide for where to put the H.) 3. Calculate the molarity of OH' in solutions with the following concentrations of H30*: a) 0.020 mol LP b) 1.0 x 10-5 mol L-1 c) 3.1 mmol-L-1 4. A careless laboratory technician prepares 300.0 mL of 0.0175 M KOH(aq) and pipets 25.0 mL of the solution into a beaker. The beaker is allowed to stand in a warm place for a day before use, during which time some of the water evaporates and the volume is reduced to 18.0 mL. a) What would the pH of the solution as initially prepared have been? b) What will the actual pH of the solution be after evaporation? 5. Calculate the equilibrium concentrations of HNO2, H3O+ and NO2 at equilibrium if the initial conc. of HNO2 is 1.0 M. Calculate the pH and pOH. (K, for HNO2 is 5.1 x 104) HNO2(aq) + H2O(1)

Answer 1

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Nicording to Bronsted Theory, an add is a subslene Mahich can lose it ion and a base is a substance which can accept it ion. Ginen reaction is Holag.) + CM₂ NHtlar) - 250 caq. ) + (1₂NH, lag. Clearly, we can see is above reaction CH₂ Nn is losing a t and forms cn₂NH2 & hso; is ackepting Ht and forms "₂50. o Mese, Bronsted acid is ch₂NH₂+ and Brunsted bace 1150,- edfter losing it (h₂ Nu becomes (2₂NN2- o Conjugare bone is chann, After garning nt uso becomes H₂ 503 inconjgove_aud isH2503__ - 1d The conjugare a cids from a given base are formed by adding it on to the base . oxalare ion 202- after accepting it bе со ме н , соч (oxcalic acicl) conjugale acid of 204 is hc04. 4 Cons NH2 after accepting Mt become Cors Nr₂t. e conjugate acid of ons Nn₂ is Gn. Nnt lebhing Ht 3 c becomes NH30n + Nn, on after e conjugate accepting it beco. acid of Nngor is Scanned with CamScanner