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Some kidney stones form by the precipitation of calcium oxalate monohydrate ( CaC₂O₄.H₂O, Ksp=2.3x10⁻⁹ ). The pH of urine varies from 5.5 to 7.0, and the average [Ca²⁺] in urine is 2.6X10⁻³ M.(a) If the [oxalic acid] in urine is 3.0X10⁻¹³ M, will kidney stones form at pH = 5.5?

Respuesta :

for CaC₂O₄, Ksp=2.3x10⁻⁹, Qsp< Ksp this indicate that it will not precipitate at ph 5.5

Steps

for CaC₂O₄ to precipitate Qsp must be greater than Ksp.

at PH= 5.5, H+ can be calculated by:

[H+] = 10^-PH

[H+] = 10^-5.5

[H+] = 3.16 x 10^-6

Determination of C2O4^-2

C2O4^-2 = K[H2C2O4] / [H+]^2

C2O4^-2= 9.073 x 10^-8

Qsp can be calculated by

Qsp=[Ca^2+][C2O4]

Qsp =[2.6×10^−3][9.073 x 10^-8]

Qsp = 2.395 x 10^ -10

for CaC₂O₄, Ksp=2.3x10⁻⁹, Qsp< Ksp this indicate that it will not precipitate at ph 5.5

What does the pH of urine mean?

7.0 is a pH of neutrality. Although the pH of ordinary urine can range from 4.5 to 8.0, the average urine sample tests at about 6.0. Your urine's basicity is indicated by a greater number. The more acidic your pee is, the lower the value.

What pH should urine have?

The normal pH range for urine is between 4.5 and 8, according to the American Association for Clinical Chemistry. A pH value of 6 or below is acidic, while a pH value of 8 or more is basic or alkaline. As part of a urinalysis, a urine pH test is performed.

learn more about pH of urine here

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