#Question id: 391
#1. Molecules and their Interaction Relevant to Biology
In a hospital laboratory, a 10.0 mL sample of gastric juice, obtained several hours after a meal, was titrated with 0.1 M NaOH to neutrality; 7.2 mL of NaOH was required. The patient’s stomach contained no ingested food or drink, thus assume that no buffers were present. What was the pH of the gastric juice?
#Question id: 393
#1. Molecules and their Interaction Relevant to Biology
Carbon dioxide (CO2) is readily soluble in water, according to the equation CO2 + H2O ↔ H2CO3. Carbonic acid (H2CO3) is a weak acid. If CO2 is bubbled into a beaker containing pure, freshly distilled water, which of the following graphs correctly describes the results?
#Question id: 400
#1. Molecules and their Interaction Relevant to Biology
Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that ________.
#Question id: 401
#1. Molecules and their Interaction Relevant to Biology
.Which of the following graphs describes the relationship between [H3O+] and pH?
#Question id: 402
#1. Molecules and their Interaction Relevant to Biology
If the DG'° of the reaction A -> B is –40 kJ/mol, under standard conditions the reaction:
#Question id: 408
#1. Molecules and their Interaction Relevant to Biology
Which of the following compounds has the largest negative value for the standard free-energy change (DG'°) upon hydrolysis?