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determine the range in ph in which 0.050 m cu2 can be quantitatively separated from 0.050 m mg2 by precipitation with oh- . the ksp for cu(oh)2 is 19.32 and the ksp for mg(oh)2 is 11.15.

Sagot :

The Ph range is 4.991 TO 9.076.

The dissolution of Mg(oh)2 is decreased by

Mg(oh)2 → Mg 2+  + 2OH-

PKsp = 11.15

Ksp =  [tex]10^{-11.5}[/tex]

OH- = 7.07 × [tex]10^{-12}[/tex]/0.050

Poh = - log 7.07 × [tex]10^{-12}[/tex]  = 4.924

The Ph range is 9.076

The dissolution of Cu(oh)2 is decreased by

Cu(oh)2 → Cu 2+  + 2OH-

PKsp = 19.32

Ksp = [tex]10^{-19.32}[/tex]

OH- = 9.7863 × [tex]10^{-10}[/tex]

Poh = - log  9.7863 × [tex]10^{-10}[/tex] = 9.009

The Ph range is 4.991 to 9.076

Water's pH is a gauge of how acidic or basic it is. The range is 0 to 14, with 7 serving as the neutral value. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values over 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in the water. Water that contains more free. hydrogen ions. is acidic, whereas water. that contains. more free hydroxyl. ions is basic. Since chemicals in the water can change pH, pH is a crucial sign of a chemical change in the water. "Logarithmic units" are used to express pH. Each value corresponds to a 10-fold variation in the water's acidity or basicity. Water with a pH. of 5 is 10 times. more acidic. than water.

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