Question

In the presence of aqueous ammonia, cobalt (III) forms the complex ion Co(NH3)6 3+. Determine the...

In the presence of aqueous ammonia, cobalt (III) forms the complex ion Co(NH3)6 3+. Determine the molar concentration of free cobalt (III) ion in solution when 0.250 mole of Co(NO3)3 is dissolved in a liter of 2.50 M aqueous ammonia.

Homework Answers

Answer #1

Co(NO3)3 = Co(III)

Co(III) + 6NH3 Co(NH3)63+

Initial concentrations: 0.25 M 2.5 M 0 M

Equilib. conc. x 1+x 0.25-x

The formation constant (Kf) for Co(NH3)63+ = 4.6*1033

i.e. 4.6*1033 = (0.25-x)/{x*(1+x)}

i.e. 4.6*1033 = (0.25-x)/(x2+x)

i.e. 4.6*1033x2 + 4.6*1033x = 0.25-x

i.e. 4.6*1033x2 + 4.6*1033x - 0.25 = 0

By solving the above quadratic equation, you will get the value of x, which is the required concentration value of free cobalt(III) ion.

In fact, the molar concentration of free cobalt (III) ion in solution ~ 0 M

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In the presence of aqueous ammonia, cobalt(III) forms the complex ion Co(NH3)63+. Determine the molar concentration...
In the presence of aqueous ammonia, cobalt(III) forms the complex ion Co(NH3)63+. Determine the molar concentration of free cobalt(III) ion in solution when 0.170 mole of Co(NO3)3 is dissolved in a liter of 2.50 M aqueous ammonia.
A solution contains 0.0500 M Co^3+ (aq), 0.0290 M S^2–(aq), and 1.65 M NH3. Cobalt(III) ions...
A solution contains 0.0500 M Co^3+ (aq), 0.0290 M S^2–(aq), and 1.65 M NH3. Cobalt(III) ions in aqueous solutions complex with NH3 to produce Co(NH3)6^(3+) . (Kf = 5.0 x 10^31) What will be the concentration of Co3 (aq) when Co(NH3)6^3+ forms? Will Co2S3 precipitate? (Ksp = 4.0 x 10–21)
A solution contains 0.0500 M Co3 (aq), 0.0230 M S2–(aq), and 2.45 M NH3. Cobalt(III) ions...
A solution contains 0.0500 M Co3 (aq), 0.0230 M S2–(aq), and 2.45 M NH3. Cobalt(III) ions in aqueous solutions complex with NH3 to produce Co(NH3)63 . (Kf = 5.0 x 1031) What will be the concentration of Co3 (aq) when Co(NH3)63 forms?
A solution contains 0.0500 M Co3 (aq), 0.0280 M S2–(aq), and 1.85 M NH3. Cobalt(III) ions...
A solution contains 0.0500 M Co3 (aq), 0.0280 M S2–(aq), and 1.85 M NH3. Cobalt(III) ions in aqueous solutions complex with NH3 to produce Co(NH3)63 . (Kf = 5.0 x 1031) What will be the concentration of Co3 (aq) when Co(NH3)63 forms? [Co3] = M Will Co2S3 precipitate? (Ksp = 4.0 x 10–21) yes/no
A solution contains 0.0500 M Co3 (aq), 0.0270 M S2–(aq), and 1.65 M NH3. Cobalt(III) ions...
A solution contains 0.0500 M Co3 (aq), 0.0270 M S2–(aq), and 1.65 M NH3. Cobalt(III) ions in aqueous solutions complex with NH3 to produce Co(NH3)63 . (Kf = 5.0 x 1031) (Part 1) What will be the concentration of Co3 (aq) when Co(NH3)63 forms? (Part 2) Will Co2S3 precipitate? (Ksp = 4.0 x 10–21)​
Cobalt forms two common ion oxidation states, Co+3 and Co+3. When solid cobalt is reacted with...
Cobalt forms two common ion oxidation states, Co+3 and Co+3. When solid cobalt is reacted with a gold (III) chloride solution, two reactions are possible, as shown in the following equations: Reaction 1) AuCl3 (aq)  + Co(s)  → Au(s)  + CoCl3 (aq) Au+3(aq)  + Co(s)  →   Au(s)  + Co+3(aq) Reaction 2) 2 AuCl3 (aq)  + 3 Co(s)  →   2 Au(s)  + 3 CoCl2 (aq) 2 Au+3(aq)  + 3 Co(s)  →   2 Au(s)  + 3 Co+2(aq) If reaction 2 is correct how many grams of solid gold (MW = 196.967) will be produced...
The complex ion [Co(OH2)6](3+) is blue in an aqueous solution. Estimate the crystal field splitting energy...
The complex ion [Co(OH2)6](3+) is blue in an aqueous solution. Estimate the crystal field splitting energy (in kJ/mol) for this ion. The complex ion [Co(OH2)6](3+) is blue in an aqueous solution. Estimate the crystal field splitting energy (in kJ/mol) for this ion. 127 kJ/mol 328 kJ/mol 302 kJ/mol 282 kJ/mol 199 kJ/mol
In the presence of excess OH-, the Zn2+(aq) ion forms a hydroxide complex ion, Zn(OH)42-. Calculate...
In the presence of excess OH-, the Zn2+(aq) ion forms a hydroxide complex ion, Zn(OH)42-. Calculate the concentration of free Zn2+ ion when 1.46×10-2 mol Zn(CH3COO)2(s) is added to 1.00 L of solution in which [OH- ] is held constant (buffered at pH 12.80). For Zn(OH)42-, Kf = 4.6×1017.
In aqueous solution the Al+3 ion forms a complex with six fluoride anions. Write the formation...
In aqueous solution the Al+3 ion forms a complex with six fluoride anions. Write the formation constant expression for the equilibrium between the hydrated metal ion and the aqueous complex. Under that, write the balanced chemical equation for the last step in the formation of the complex.
You have synthesized a redox reagent that is a complex between cobalt and six ammonia molecules...
You have synthesized a redox reagent that is a complex between cobalt and six ammonia molecules ([Co(NH3)6] 3+/2+). It cycles between the Co(II) and Co(III) oxidation states. Unfortunately, after you complete your synthesis, you learn that your potentiostat is broken and you have no way to measure the reduction potential of your compound. Fortunately, you realize that you have sufficient information from other experiments and from data tables to determine the potential for this reagent. This information is: The standard...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT