Predicted pH range (acid/base) Measured pH 0.100M HCI+ Lemon juice 0.100M HCI+7-
ID: 1039956 • Letter: P
Question
Predicted pH range (acid/base) Measured pH 0.100M HCI+ Lemon juice 0.100M HCI+7-Up 0.100M HCI+ Coca-Cola 0.100M HCI+ Black coffee 0.100M HCI+ Orange juice. 0.100M HCl + Grape juice 0.100M HCI+ tap water 0.100M HCI+ vinegar 75 a C a c Under the acidic conditions of the human stomach, did the pH values pictured on the image match the measured values, in general? Referring to the third entry in the table above, what happens to the pH when equimolar amounts of strong acid and strong base are combined? What do you predict will happen to the pH of the human stomach if one drinks weakly basic "slightly alkaline" water on a regular basis? Another experiment to try, is to add a marshmallow to the 0.100M HCI solution, the 0.100M NaOH solution, and also to the 0.100M HCI+0.100M NaOH solution. Which solution do you predict will dissolve (ie: "digest") the food item best?
Explanation / Answer
a) The pH of the stomach is acidic and it ranges in between 1.5 to 3.5. All the food/ drink items listed are acidic which furter reduces the pH of stomach.So, pH values pictured on images matach th emeasured values.
b) Eqimolecular amounts of strong acid and strong base neutralise each other and hence the pH will not change.
c) If one drinks ' slightly alkaline' water on regyular basis the pH of stomach will increase.
d) Marshmallow contains sugars which are neutral substances and it will dissolve in neutral solution ( 0.100 M HCl + 0.100 M NaOH).