Acolumn is packed with 0.5 g of a strongly acidic ion exchange resin in h+ form. a 1.0 m nacl solution is passed through the column until the eluant coming out becomes neutral. the collected eluant is completely neutralized by 17 ml. of 0.5 m naoh. the ion exchange capacity of the resin is:

(a) 1.00 meq/g(b) 1.25 meq/g

(c) 1.50 meq/g(d) 1.75 meq/g

The correct answer is 17 meq/g

Explanation:

Ion exchange capacity (IEC) express the total of active sites of a resin in which ions are attached because the greater molecular weight.

The exchange Reaction can be represented as

R-H

The IEC value (in meq/g) is determinated by using the next equation:

IEC=[(mL of NaOH)*(M of NaOH)]/mass of resin

IEC [(17 mL)*(0.5 M)/0.5]= 17 meq/g

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.