LAB SECTION: NAME: EXPERIMENT 24: Brensted-Lowry Acids and Bases POSTLABEXERCISE

Question

LAB SECTION: NAME: EXPERIMENT 24: Brensted-Lowry Acids and Bases POSTLABEXERCISE 1. write the net ionic equation for the CaH,H o tion in Part B 2. write equation in question 1 reacting with the solution you the net ionic for the products of the reaction chose in Part B (NaCH,or Naci. NaHSO). 3. A few mL of 15 MHCI are added to 20 mLof So M Nac,H,o, a. Will the initial pH of the e20 M Nac H,o, be greater than, less than, or equal to 7? B. Less than 7 C. Equal to 7 A. Greater than 7 b. As HCI is added to the So M NaC,H,0, .will the pH of the solution increase, decrease, or remain unchanged? C. Remain unchanged B. Decrease A. Increase c. Write the net ionic equation for the reaction between the HCl solution and the NaC,Hon solution. 4. A solution has a hydroxide concentration of l. (13 M. Calculate a. pH b. poH

Explanation / Answer

1) The balanced chemical equation is

CaH2 (aq) + 2 H2O (l) -------> Ca(OH)2 (aq) + 2 H2 (g)

Decompose the aqueous species into ions and write the ionic equation as

Ca2+ (aq) + 2 H- (aq) + 2 H2O (l) ------> Ca2+ (aq) + 2 OH- (aq) + 2 H2 (g)

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