You are given a 400 mL buffer solution comprised of 0.035 M HF and 0.0125 M NaF. Do you need to add acid or base to the original solution to reach a desired pH of 3.50

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

One similarity and one difference between an element and a mixture of elements

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule