Final answer:
Yes, a precipitate of AgBr will form.
Step-by-step explanation:
To determine whether a precipitate will form when 300 mL of 5*10^-5 M AgNO3 is added to 200 mL of 2.5 * 1 M NaBr, we need to compare the solubility product constants (Ksp) of the possible precipitates.
The balanced equation for the reaction is:
AgNO3(aq) + NaBr(aq) → AgBr(s) + NaNO3(aq)
The Ksp of AgBr is 5.0 x 10^-13, which is smaller than the product of the concentration of Ag+ and Br- in the solution (5*10^-5 M x 2.5 * 1M = 1.25 x 10^-4). Therefore, a precipitate of AgBr will form.