Abuffer is made by dissolving 11.6 g of sodium dihydrogen phosphate, nah2po4 (mr = 119.97701128 g/mol), and 20.1 g of disodium hydrogen phosphate, na2hpo4 (mr = 141.95884056 g/mol), in a liter of solution. what is the ph of the buffer? (assume ka for this equilibrium is 6.2 ✕ 10−8, and that kw is 1.0 ✕ 10−14.)

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.