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1. At 5°C, the auto-ionization constant of water is 1.8x1015. Which of the following is/are true
at 5°C for an aqueous solution that has a pH of 7'? I: The solution is neutral (1) Only I 11:
1H30'I > 10 (3) I and III 111: pOH = 7 (2) Only II (4) II and III (5) None
Solution
Kw at 5°C = - log (1.8*10^-15) => 14.74
So neutral point = 7.37.
So at pH = 7, there will be [H+] > [OH-], acidic solution.
Answer is 2) only II

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  • 1. 1. At 5°C, the auto-ionization constant of water is 1.8x1015. Which of the following is/are true at 5°C for an aqueous solution that has a pH of 7'? I: The solution is neutral (1) Only I 11: 1H30'I > 10 (3) I and III 111: pOH = 7 (2) Only II (4) II and III (5) None Solution Kw at 5°C = - log (1.8*10^-15) => 14.74 So neutral point = 7.37. So at pH = 7, there will be [H+] > [OH-], acidic solution. Answer is 2) only II