Ross attempted to titrate 30.0 mL of NaOH solution with 1.0 M HCl solution. The flask of NaOH solution contained 0.00300 mole of NaOH. Ross carelessly added 5.0 mL of HCl solution to the NaOH and observed blue litmus paper in the flask turn pink. What was the hydrogen ion concentration in the flask after all the HCl was added?
A
1.0 × 10-7 mol/L

B
2.0 × 10-3 mol/L

C
5.7 × 10-2 mol/L

D
6.7 × 10-2 mol/L

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

Once similarity and one difference between a mixture of elements and a mixture of compounds

Which of the following involves only abiotic factors? a. a large rock being weathered by wind and rain b. an otter using a stone to break open a sea urchin c. a spider building a web in the corner of a building d. a pine tree absorbing light from the sun