for lead bromide at 25¬°C is . What are the concentrations of the lead and bromide ions?
The dissolution begins with a fixed number of moles of lead bromide. When the lead bromide dissolves, the same fixed number of moles of lead ions is created. Since there are twice as many bromide ions as there are lead ions, there must be twice as many moles of bromide ions present. Therefore, whatever the concentration of the lead ions is, the concentration of the bromide ions must be twice as large. can then be represented as