The following equilibria exist in this solution: ■(H_2 X(aq)+H_2 O(l) ⇌ 〖HX〗^- (aq)+ H_3 O^+ (aq) &K_1=8.3× 10^(-8)@〖HX〗^- (aq)+H_2 O(l) ⇌ X^(2-) (aq)+ H_3 O^+ (aq) &K_2=1.0× 10^(-14) )The top reaction goes to equilibrium, and then the second reaction starts. Calculate the concentration of X2- in these solutions.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt