(1) Identify the acid-base conjugate pairs in each of the following reactions: (

Question

(1) Identify the acid-base conjugate pairs in each of the following reactions: (a)CH,CO0+HCN CH,COOH +CN (d)HCIOCH,NH CHINHS+CIO (2) Classify each of the following species as a weak or strong acid (a) HNC), (b) HF. (c) H2SO.. (d) HSO. , (e) H2co, (f) HCO)(g) HCL (h) HCN, (i) HN02. (3) Predict whether the following solutions are acidic, basic, or nearly neutral (a) NaBr, (b) K:SO, (c) NHANO2, (d) Cr(NO)s. in mol/L for solutions with the following pH values: (4) Calculate the hydrogen ion c (a) 2.42, (b) 11.21, (c) 6.96, (d) 15.00. (5) Calculate the pH of each of the following solutions: (a) 0.0010 MHC (b) 0.76 M KOH: (c) 0.0187 M CHC00H, (K. for CHCOOH-1.8 × 10 5); (d) 0.040 Af H2SO4 (Hint. H2SO4 is a strong acid; K, for HSO 1.3 x 10.2.) (6) Calculate the percent ionization of hydrofluoric acid at the following concentrations: (a) 0.60 AM (b) 0.0046 M (c) 0.00028 M (d) As the solution becomes more dilute, what happens to the percent ionization? ionized acid concentration at x100% (K, for hydrofluoric acid-7.1x 10: per onization initial concentration of acid

Explanation / Answer

1. CONJUGATE ACID BASE PAIR HAVE ONLYA DIFFERENCE OF 1 H ATOM

A. CH3COO- AND CH3COOH, CN- AND HCN

B. HCO3- AND H2CO3, CO32- AND HCO3-

C. HPO42- AND H2PO4-, NH3 AND NH4+

D. ClO- AND HClO , CH3NH2 AND CH3NH3+

E. CO32- AND HCO3-, AND OH- AND H2O

2.

Strong acid : HNO3, HF, H2SO4, HCl

Weak Acid : HNO2, HSO4-, H2CO3, HCN

3.

Salts of strong acid and strong base are nuetral

Nuetral salts are : NaBr

Salts of strong acid and weak base are acidic

acidic salts: NH4NO2, Cr(NO3)2

salts of weak acid and strong base are basic

Basic salts: K2SO3

4.

H+= 10-pH

a. H+ = 10-2.2

=0.0063 M

b.

H+ = 10-11

c.

H+ = 10-6.96

=1.9 * 10-7 M

d.

H+ = 10-15M

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