7) Which one of the following is the weakest acid? A) HF (Ka = 6.8 × 10-4)
B) HClO (Ka = 3.0 × 10-8)
C) HNO2 (Ka = 4.5 × 10-4)
D) HCN (Ka = 4.9 × 10-10)
B) 5.7 x 10–2 M D) 2.9 x 10–3 M
22) Calculate the hydrogen ion concentration in a solution of iced tea with lemon having a pH of 2.87.
A) 2.9x10–2M D) 2.9x10–3M B) 5.7 x 10–2 M E) 5.7 x 10–4 M C) 1.3 x 10–3 M
23) You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? [Ka = 1.8 x 10–5]
A) 4.65 B) 4.71 C) 4.56 D) 4.84
PLEASE solve all the Q.
D) HCN (Ka = 4.9 × 10-10)
HCN has less Ka values. So it is weak acid
22.
PH = 2.87
-log[H^+] = 2.87
[H^+] = 10^-2.87 = 0.0013M
C) 1.3 x 10–3 M >>>>answer
23.
no of moles of CH3COOH = molarity * volume in L
= 0.3*0.5
= 0.15moles
no of moles of CH3COONa = molarity * volume in L
= 0.2*0.5
= 0.1moles
no of moles of NaOH = molarity * volume in L
= 1*0.02 = 0.02moles
no of moles of CH3COOH after addition of 0.02 moles of NaOH = 0.15-0.02 = 0.13 moles
no of moles of CH3COOna after addition of 0.02 moles of NaOH = 0.1+0.02 = 0.12moles
PKa = -logKa
= -log1.8*10^-5
= 4.74
PH = Pka + log[CH3COONa]/[CH3COOH]
= 4.74 + log0.12/0.13
= 4.75 -0.03476
= 4.71
B) 4.71 >>>>answer
7) Which one of the following is the weakest acid? A) HF (Ka = 6.8 ×...
5) Of the following acids, ________ is a strong acid. A) HNO2 B) H2CO3 C) HNO3 D) HClO 6) Calculate the hydrogen ion concentration in a solution of iced tea with lemon having a pH of 2.87. A) 2.9 x 10–2 M C) 1.3 x 10–3 M 7) Which one of the following is the weakest acid? A) HF (Ka = 6.8 × 10-4) B) HClO (Ka = 3.0 × 10-8) C) HNO2 (Ka = 4.5 × 10-4) D) HCN...
CHEM107 ACID_BASE BUFFERS AND PH UNIT-25 CTO-13: You have 500.0 mL of a buffer solution containing 0.20 Macetic acid CH3COOH) and 0.30 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? (Ka=1.8 x 10-51 1) 4.41 B) 4.74 C) 4.56 D) 4.92 E) 5.07
em 12 Part A Which one of the following is the weakest acid? HF (Ka = 6.5 x 10-4) HCN (Ka = 6.3 x 10-10) HNO2 (Ka = 4.5 x 10-4) HCIO (Ka = 3.0 x 10-8) Submit Request Answer Provide Feedback Lê - 9 we e
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Acetic acid (CH3COOH,CH3COOH, ?a=5.62×10−5)Ka=5.62×10−5) is a weak acid, so the salt sodium acetate (CH3COONa)CH3COONa) acts as a weak base. Calculate the pH of a 0.445 M0.445 M solution of sodium acetate.
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7. Calculate the mass of sodium acetate (CH3COONa) that must be added to 1.00 L 0.450 M acetic acid (CH3COOH), Ka = 1.8 x 10 ) to form a pH = 5.00 buffer. Ka = 1.8 x 109.
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