A sample of lemon juice was found to have a pH of 2.45. What is the H^+ concentr

Question

A sample of lemon juice was found to have a pH of 2.45. What is the H^+ concentration in the juice? 0.008 M 280 M 0.086 M 0.0025 M A solution containing 75.0 mL of 0.150 M strong acid (HCl), is titrated with 0.300 M strong has (NaOH). What is the mu H of the resulting solution at the equivalent point? 7.0 13.2 12.9 14.0 Which of the following species is the weakest acid H_2CO_3 HCO_3 CO_2 CO.3^2. A process that occurs without heat transfer between system and its surrounding is said to be: Open close adiabatic reversible The energy needed to raise the temperature of 100 g of substance A from 5 degree C to 95 degree C is 87.620 kJ. The specific heat capacity (J/g degree C) of A is: 4.185 7.753 9.735 other value

Explanation / Answer

(i) Lemon juice

pH = -log[H+] = 2.45

So, [H+] is,

d. 0.0025 M

(ii) pH at equivalence point

a. 7.0

(iii) Weakest acid species,

d. CO3^2-

(iv) process without heat transfer between system and surrounding is,

c. adiabatic

(v) Total energy needed

specifc heat of A = 87620/100 x 90 = 9.735 J/g.oC

Answer : c. 9.735

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