Question

1. 4.4 6.2 A substance is orange in methyl orange, purple in crystal violet, yellow in bromthymol blue, colorless in phenolphthalein, green in bromcresol green, and yellow in allizarin yellow-R. What is the narrowest pH range it can have 8.3 oH Explain: 2. Write the balanced equation for the reaction of NaOH with H2S04: 3. (a) Why do we run the titrant from the burette into a waste beaker before beginning the titration? (b) How much HCl do we initially add to our erlenmeyer flask in Part 2?

Answer 1

2 2NaOH (ag) +1h so (aq.) Nag sou laa.) Base Acid salt telhole) It's an aid base reaction to form salt and water neutralisation reaction 3) a) We reen tetrant into waste beaker so that the tip of the burette is (bottom) filled with tetrant and no air gap remains which gives the correct reading of the titration b Hclamant to be added You Have to See hart 2 Because you have not focovided data related to that part. 4. 35mL (Calotion solution with 26. 3mL of 0.175 N acid Reaction taking place, Ca(OH)₂ +2461 Call +24₂0 N, V = N₂V2 Calon Hel Nx 35ml = 0.175N X 26.3mL N=0.13150 Thus, normality of Calot, was found to be 0.1315N 1 H₂CO3 +2Naoh Nazloz +2140 (aq) c) (aq) HNO + Rbot Cy) (a) 2) Calott, + 2H1 t3 poglaq.) +3 Nach Rb No, tho 09.) a Callz (aq.) +2460(4) Nagpoy +H₂O a.) a)