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4. Calcium ion forms a weak 1:1 complex with nitrate ion with a formation constant of...

4. Calcium ion forms a weak 1:1 complex with nitrate ion with a formation constant of 2.0. What would the equilibrim concentrations of Ca2+ and Ca(NO3)+ in a solution prepared by adding 10.0 mL each of 0.010 M M CaCl2 and 2.0 M NaNO3? (neglect diverse ion effects).  

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Expert Solution

STANDARD REACTION OF FORMATION OF 1:1 COMPLEX

formation constant (Kf)....

......(1)

here, both reagents are strong ionic salt and both will 100 % ionize....

standard reaction is...

from stoichiometric coefficient value it is clear that 2 mole NaNO3 required 1 mole CaCl2.

here, mole of CaCl2 = molarity * vol in lit = 0.010 * 0.01 = 0.0001

mole of NaNO3 = 2 * 0.01 = 0.02

therefore, to complete the reaction 0.01 mole CaCl2 is required but only 0.0001 mole of CaCl2 is present. therefore, CaCl2 is the limiting reagent.

from the dissociation of CaCl2....the value of [Ca2+] will be = 0.010 M

and from dissociation of NaNO3... the value of [NO3-] will be = 2.0 M

from the above equation (1)...

or, [Ca(NO3)+] = 0.04 M

queen_honey_blossom answered 1 year ago
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