Question

3. i). Write the formula of four strong acids and four strong bases. ii). List four factors that affect the strength of an acid. iii). Predict the relative strength of the following compounds: H2O, H2S and H2Se. iv). Which of the following is the stronger acids: CHCICOOH or CHCI-COOH? Explain. v). Al 3* is not a Bronsted acid, Al(H2O)" is. Explain. vi). All Bronsted acids are Lewis acids, but the reverse is not true. Give two examples of two Lewis acids that are not Bronsted acids. vii). Which of the following is the stronger base: NH3 or NF3? viii). Which of the following is the stronger Base: NH3 or PH;?! 4. a. Describe the hydration of SO3 as a Lewis acid-base reaction. b. Identify Lewis acid and Lewis base in each of the following reaction:

Answer 1

i) Strong acids Strong bases Hee HBO H[CF350,7 (Triflic -and) H₂SO4 KOH No он. caColt), LOL four factors affect the strength of an aid.. ;) oxidation state of center abom. Ü) Electronegetivity in) Inductive effect. in fase of release proton. in H₂O Has and H₂ se. H₂O is voor acidic among these three. This is due to the strong 0-4 bond and also hydrogen bond. in case of se-H and S-H, se-t is more weaker so to se is more acidic

According to Boonsted acid concept proton donor is acid, were ALBt. has no proton so it is not acidic where as ALC40.) 37 hard proton donating ability that it is Bronsted acid. CH₂ - Coot ACH-CoolH. co a B Among these two ® is stronger acid thom ® this is due to the more incretive effect of Chhorine otoms. In case of B there are two d'otom attach to a C atom which withdraw the election density of from carboxylic carbone & But for I only one chlorine atom is not withdraw as much amaunt as in case of .

©2- K 26 Among these two Nth hard higher tendeney to lose the electron pair to any élection deficient Compound. This is because & H har less elechonegetivity than N, so the total electron cloud is centered on nitrogen. In case of Nf3 the total electron density withdrawn from nitrogen center. by more elecho- negetive f atom. So less able to donate the lone pair.