1. how to prepare an HNO3 solution (50ml) with a concentration of 15 mM from 70% HNO3 (density: 1.42g/ml) 2. what is the molar concentration of Pb2+ (15 ppb)

3. What is the pH of acetic acid (10 mM, ka = 1.8x10^-5)

4. How to prepare a 2L sodium phospate (50 mM, pH 7.4)

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.

If 10.0 ml of the solution on the right are withdrawn from the 100 ml beaker and diluted again in a similar manner, what is the new concentration? m nacl

What is the polyatamic ion of thiosulfate