Question

please i need help with these questions... thanks so much

[References) Use the References to access important values if needed for this question. A 1.00 liter solution contains 0.44 M nitrous acid and 0.57 M sodium nitrite. 10.140 moles of calcium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of calcium hydroxide.) True A. The number of moles of HNO, will decrease. B. The number of moles of NO, will decrease. True False C. The equilibrium concentration of H2O will decrease. D. The pH will decrease. E. The ratio of [HNO2]/[NO2] will decrease. Submit Answer Retry Entire Group 4 more group attempts remaining

Answer 1

[References) Use the References to access important values if needed for this question. A 1.00 liter solution contains 0.44 M nitrous acid and 0.57 M sodium nitrite. 10.140 moles of calcium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of calcium hydroxide.) True A. The number of moles of HNO, will decrease. True B. The number of moles of NO, will decrease. false True False C. The equilibrium concentration of H:0" will decrease. true D. The pH will decrease false E. The ratio of [HNO2]/[NO2 ] will decrease. True Submit Answer Retry Entire Group 4 more group attempts remaining

[References) Use the References to access important values if needed for this question. A 1.00 liter solution contains 0.45 M ammonia and 0.35 M ammonium iodide. If 0.17 moles of nitric acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of nitric acid.) false A. The number of moles of NH3 will remain the same false B. The number of moles of NH, will decrease. true » C. The equilibrium concentration of H20 will increase. false D. The pH will remain the same. true E. The ratio of [NH]/[NH4+] will decrease. Submit Answer Retry Entire Group 4 more group attempts remaining

3)

pH = pKa + log [HPO42- / H2PO4-]

    = 7.21 + log [0.342 / 0.359]

pH = 7.189

moles of HNO3 added = 0.084 mol

pH = pKa + log [salt - C / acid + C]

    = 7.21 + log [0.342 - 0.084 / 0.359 + 0.084]

pH = 6.975

pH change = - 0.214