Question

Please answer the following 3 questions that pertain to the graph shown.

Additional Questions Use the titration curve of Na, CO, with HCl shown in Figure 7-5 to answer the following questions: 1. a. At the start of the titration (before any HCl has been added), is the solution basic or acidic? Explain. b. At the first end point, what reaction is stoichiometrically complete? c. At the second end point, what reaction is stoichiometrically complete? 2. Use Figure 7-5 to graphically determine the pH at the two equivalence points. Label these points on the axes of the graph 3. Using your text, propose a suitable indicator to use in the lab for each end point. Explain your choices.

Answer 1

Ans a) At the start q titration, when no Hcl was added then rolume a thoutant titrant added was zero- At that point pH was equals to u (approximately). and solution was basic. This point is starting & graphi b) At 13+ End point pH is about 7 (Neturul solution) 7 At and end point pr is about Recution & Na Coz VS Hel 19,03 + HCI- Вq4e auid Alq HCO3 + NaCl bat Ist end this species is formed. 119, Coz take c) At and end point, complete meterilization % place H₂CO3 + nach NaHCO3 + Hol a II K starting 8 titouttons PH _Ilequivalence point * Ind end point volume of He added (ml)