Could someone please help me with questions 3, 6, & 10? I\'m having difficulty w

Question

Could someone please help me with questions 3, 6, & 10? I'm having difficulty with how to solve for 3 & 10 and I can't seem to figure out how to determine the answer for #6. Thank you. 1. which type type noncovalent interaction is non-specific (i.e., 10, 2017, 9 an Apill of each other, without regard for occurs between any two atoms that approach the type of atom)? a) Ionic interactions ("salt links") b) Hydrogen bonds van der Waals interactions h d) Hydrophobic interactions blanks: HF, hydrofluoric acid, is a POLAR (polar/nonpolar) molecule and therefore is expected to be H DROP HIL (hydrophilie hydrophobic). SPELLING COUNTS! 3. (1 pt.) If you have a solution of 100 mM carbonic acid (Hzcoa) and 10 mM sodium bicarbonate (Nahcoal, what would you expect the pH to be, given that the pKa is 6.37? a) 5.37 b) 6.37 c) 7.37 4. (1 pt.) At which point of a titration curve would you expect to find equivalent amounts of acid and base? a) Buffering region b) equivalence point c) Equivalence point d) All of the above (1 pt.) What functional group does the amino acid histidine possess? a) Guanidino b) Hydroyxl imidazole N

Explanation / Answer

3)

H2CO3 and NaHCO3 will form buffer

use:

pH = pKa + log {[NaHCO3]/[H2CO3]}

pH = 6.37 + log (10 mM / 100 mM)

pH = 6.37 + log (0.1)

pH = 6.37 - 1

= 5.37

Answer: a

i am allowed to answer only question at a time

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