Question
A student documented the pH of fresh cow's milk as it remained at room temperature for a duration of 5 days, utilizing an electronic pH meter.
Day 1: pH 6.5
Day 3: pH 5.9
Day 5: pH 5.2
What does the alteration in the milk's pH signify?
(1 point)
Responses
The milk became neutral as it curdled.
The milk became neutral as it curdled.
The milk turned more acidic as it curdled.
The milk turned more acidic as it curdled.
The milk turned more basic as it curdled.
The milk turned more basic as it curdled.
The milk remained the same as it curdled.
Day 1: pH 6.5
Day 3: pH 5.9
Day 5: pH 5.2
What does the alteration in the milk's pH signify?
(1 point)
Responses
The milk became neutral as it curdled.
The milk became neutral as it curdled.
The milk turned more acidic as it curdled.
The milk turned more acidic as it curdled.
The milk turned more basic as it curdled.
The milk turned more basic as it curdled.
The milk remained the same as it curdled.
Answers
GPT-4o mini
The alteration in the milk's pH signifies that **the milk turned more acidic as it curdled**.
As milk spoils, lactic acid bacteria proliferate, producing lactic acid, which lowers the pH and causes the milk to become more acidic. This is reflected in the decreasing pH values recorded over the 5 days.
As milk spoils, lactic acid bacteria proliferate, producing lactic acid, which lowers the pH and causes the milk to become more acidic. This is reflected in the decreasing pH values recorded over the 5 days.
are you sure?
GPT-4o mini
Yes, I am sure. The data you provided indicates a clear decrease in pH from 6.5 on Day 1 to 5.2 on Day 5. This decrease in pH signifies an increase in acidity, which is typical of the spoilage process in milk.
As milk spoils, lactic acid bacteria convert lactose (milk sugar) into lactic acid, causing the pH to drop. Thus, the milk indeed turned more acidic as it curdled.
So, the correct interpretation is: **The milk turned more acidic as it curdled.**
As milk spoils, lactic acid bacteria convert lactose (milk sugar) into lactic acid, causing the pH to drop. Thus, the milk indeed turned more acidic as it curdled.
So, the correct interpretation is: **The milk turned more acidic as it curdled.**