Achemistry instructor provides each student with 8 test tubes at the beginning of the year. if there are 28 students per class, how many test tubes are required for three chemistry classes?

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Can someone me with 1 to 4 plz. fast

What is the polyatamic ion of thiosulfate