0.10 m potassium chromate is slowly added to a solution containing 0.20 m agno3 and 0.20 m ba(no3)2. what is the ag+ concentration when bacro4 just starts to precipitate? ksp for ag2cro4 and bacro4 are 1.1 × 10-12 and 1.2 × 10-10, respectively.

Explanation:

Given:

[AgNO3] = 0.20 M

Ba(NO3)2 = 0.20 M

[K2CrO4] = 0.10 M

Ksp of Ag2CrO4 = 1.1 x 10^-12

Ksp of BaCrO4 = 1.1 x 10^-10

Now,

So, BaCrO4 will start precipitating when [Ag+] is 4.2 x 1.2^-2 M

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explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.