Question

Numbers 9-14 are predominant species problems! Explain your answer. Which of the following best describes the composition of a solution labeled "0.10 M H,So"? 9. [H2SO] = 0.10M b. [H]>0.10 M, (So21 -0.10 M c. [H']= 0.20 M, [SO10.10 M d. [H']>0.10 M, [HSO.] <0.10 M e. [H'] 0.10 M, [HSO4] = 0.10 M a. 10. Which of the following best describes the composition of a solution labeled "O.10 M HCI"? [HCI) 0.10 M b. [H]<0.10 M, [CI]< 0.10 M c. [H'] 0.10 M, [CI] = 0.10 M a. 11. Which of the following best describes the composition of a solution labeled "0.10 M NaOH"? [NaOH] 0.10 M a. [Na]<0.10 M, [OH]<0.10 M [Na'] 0.10 M, [OH] = 0.10 M [Na'] 0.10 M, (H'] = 0.10 M, [O'] = 0.10 M [Na']<0.10 M, [H°] < 0.10 M, [o']<0.10 M b. c. d. e. 12. Which of the following best describes the composition of a solution labeled "O.10 M HCIO"? a. [HCIO] 0.10 M b. [H] 0.10 M, [CIO'] = 0.10 M c. [H']< 0.10 M, [CIO'] < 0.10 M [H]- 0.10 M, [CI]= 0.10 M, [0'1 = 0.10 M d. 13. Which of the following best describes the composition of a solution labeled "0.10 M NaF"?" a. [Na'] 0.10 M, [F] = 0.10 M b. [Na']< 0.10 M, [F] < 0.10 M c. [Na'] 0.10 M, [F] < 0.10 M, [HF] >0 M d. [Na] 0.10M, [HF] 0.10 M e. [Na']<0.10 M, [HF] < 0.10 M 14. Write the species in solution for the following mixtures. Identify each as a weak/strong acid, weak/strong base, or spectator. Write any stoichiometric reactions that take place. 0.10 M NaCN and 0.050 M HCN a. b. 0.12 M HBr and 0.16 KBro 0.070 HCIO and 0.10 M NaOH c. 15. If any of the solutions in the previous problem form a buffer explain why and determine the pH.

Answer 1

(9) Given the concentration of HSO, is 0.10 M write the ionisation of HSO as follows: 4 HSO 2H*SO 2 1mol of HSO gives 2 moles of H and 1 mole of SO,2- = 2xmoles of HSO moles of H moles of SO42= moles of H2SO for constant volume, H= 2H,SO, = 2 (0.10 M) = 0.20 M [so1= [H,SO,] 2- = 0.10 M Therefore, the correct option is c (10) Given the concentration of HCl is 0.10 M write the ionisation of HCl as follows >H C HCl 1mol of HCl gives 1 mole of H and 1mole of CI. moles of H moles of HC moles of CI = moles of HCI for constant volume, H HC = 0.10 M [ст]- [на] 0.10 M Therefore, the correct option is C

(11) Given the concentration of NaOH is 0.10 M write the ionisation of NaOH as follows Na OH NaOH 1mol of NaOH gives 1 mole of Na and 1m ole ofOH moles of Na = moles of NaOH moles of OH = moles of NaOH for constant volume [Na]- [NAOH] = 0.10 M [OH]- [NaOH = 0.10 M Therefore, the correct option is c (12) Given the concentration of HCOis 010 M write the ionisation of HC1O as follows H C1O HC1O 1mol of HC1O gives 1 mole of Ht and 1 mole of C1O moles of H moles of HCO moles of ClO = moles of HCIO for constant volume [H- [HCIO] = 0.10 M [ao-]= [Hao] = 0.10 M Therefore, the correct option is b