Question

Show all work 1. How many ml of a 0.2 M NaOH solution are required to bring the pH of 20 ml of a 0.4 M HCI solution to 7.0? How many ml of a 0.2 M NaOH solution are required to bring the pll of 20 ml of a 0.4 M H2SO4 solution to 7.0? 2. Answer the following questions: i) Draw a tripeptide having R groups consisting of methyl, hydroxyl, and phenol groups. ii) When a protein is dissolved in water, the amino acids found in its interior are likely to have R groups which are: a) hydrophilic b) charged c) highly reduced d) polar e) all of the above f) none of the above hydrophobic 3. You have 200 mg of aspirin (FW=180g/mole) dissolved in 50 mL of water. You take 5 mL of this solution and bring it to 200 mL with water. You then take 100 mL of that and bring it to 1000 mL with water. You take 5 mL of that solution and add it to 10 mL of water. What is the molarity of aspirin in the final solution?

Answer 1

Hd pH=70 means It is neutral solution for Naoh and Hl titration plt=7 at Equivalence point . HU + NaOH = Nad +H2O . ind Imol ind and NaoH M = 0.4M M₂ = 0.2m 4,=20me n, = 1 mol n = 1 mol MUI = M2 V 2 ya = Mumm 04x20 xóz =40ml volume & Nash = 40m2 brey a NOOH +HS Nasa +2420 1 2 mol imol la = ? 6 hersket NADH M₂ = D-24 M, = 0.4M V -2001 ųz? n=1 M =2 mil a som : volume of Wash =80m2