2 oops, gave wrong units. edited May 26 '17 at 17:47 airhuff 15k77 gold badges3232 silver badges158158 bronze badges Barium nitrate has a water solubility of $$\pu{10.5g/mL}$$$$\pu{10.5g/100mL}$$ at $$\pu{25^oC}$$. It isn't specified in the question what concentration of sulfate you suspect might be present, but given that you are trying to check for sulfate by precipitating with barium, barium nitrate should be the way to go. Barium nitrate has a water solubility of $$\pu{10.5g/mL}$$ at $$\pu{25^oC}$$. It isn't specified in the question what concentration of sulfate you suspect might be present, but given that you are trying to check for sulfate by precipitating with barium, barium nitrate should be the way to go. Barium nitrate has a water solubility of $$\pu{10.5g/100mL}$$ at $$\pu{25^oC}$$. It isn't specified in the question what concentration of sulfate you suspect might be present, but given that you are trying to check for sulfate by precipitating with barium, barium nitrate should be the way to go. 1 answered May 26 '17 at 16:29 airhuff 15k77 gold badges3232 silver badges158158 bronze badges Barium nitrate has a water solubility of $$\pu{10.5g/mL}$$ at $$\pu{25^oC}$$. It isn't specified in the question what concentration of sulfate you suspect might be present, but given that you are trying to check for sulfate by precipitating with barium, barium nitrate should be the way to go.