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16 Jun 2020

CO2 absorbed from the air produced in the swimming pool to form a solution which comtains 2 * 10-4 M  [CO32-]. If the pool water was originally 4 * 10-3 M  [Mg2+], 6 * 10-4 M in [Ca2+] and 8 * 10-7 M in [Fe2+], then a precipitate should form of:

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General Chemistry 2
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Solve problems relating to precipitation
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Related questions

In the lime soda process at one time used in large scale municipal water softening, calcium hydroxide prepared from lime and sodium carbonate are added to precipitate Ca2+ as CaCO3(s) and Mg2+ as Mg(OH)2 (s):

Ca2+(aq) + CO32-(aq) CaCO3(s)
Mg 2+(aq) + 2OH-(aq) MgOH2(s)

How many moles of Ca(OH)2 and Na2CO3 should be added to soften 1200 L of water in which

[Ca2+] = 5.0 × 10-4 M and [Mg2+] = 7.0 × 10-4 M?

A solution contains Ba2+ (1.0 × 10-3 M), Ca2+ (1.0 × 10-3 M) and K+ (1.0 × 10-3 M). Drops of a 5.0 × 10-1 M solution of NaF were added through a microburet until the [F-] in the solution mix reached 1.5 × 10-3 M. Should a precipitate form? If so, what is the precipitate? The Ksp values are BaF2: 1.0 × 10-6, CaF2: 5.3 × 10-9. (Neglect the slight change in volume resulting from the added NaF solution.)

no precipitate should form

a precipitate consisting of CaF2 only should form

a precipitate consisting of BaF2 only should form

a precipitate consisting of CaF2 and KF should form

a precipitate consisting of BaF2 and CaF2 should form

A Ca 2+ ion-selective electrode was calibrated in metal ion buffers with ionic strength fixed at 0.50 M. The electrode is also sensitive to Mg2+. 1a)What is the general expression for the response of this electrode, including the Mg 2+ slectivity coefficient. What is the purpose of fixing the ionic strength of the calibration points?

1b.) Derive the equation for the response of the electrode to Ca 2+ and Mg 2+ from the data below.

[Ca2+] (M) [Mg2+] (M) mV
1.00 x 10-6 0 -55.4
2.5 x 10-4 0 +17.2
1.00 x 10-6 3.7 x 10-3 -41.1

1c.) In region rich in limestone deposits, [Ca2+] in streams is about 1.0*10-5 M. A Ca2+ ion selective electrode can be used for continuous monitoring of [Ca2+] in streams. High levels of Mg2+ can interfere with this measurement.

From answer in part (b), calculate the maximum [Mg2+] that can be tolerated to ensure less than a 10 % error in the measured [Ca2+].

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