A buffer containe 0.010mol of lactic acid pka 3.86 and 0.050mol of sodium lactate per liter calculate the pH of the buffer calculate the change in pH when 5ml of 0.5m of HCl is added to 1m of the buffer what pH change would you expect if you added the same quantity of HCl to 1l of pure water.​

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size