Which acid causes the sourness of green apples?

citric acid
malic acid
lactic acid
formic acid
Malic acid is more sour than citric acid, and is the source of extreme tartness in so-­called extreme candy. Malic acid occurs nat­u­ral­ly in all fruits and many veg­eta­bles.

Answers distribution

citric acid
malic acid
lactic acid
formic acid
answers
flagNorway
12%
69%
7%
10%
39
flagGermany
16%
65%
9%
8%
200
flagItaly
13%
65%
10%
10%
38
flagPoland
20%
64%
6%
7%
18956
flagSpain
20%
62%
4%
8%
24
flagAustria
29%
58%
0%
11%
17
flagthe United Kingdom
26%
57%
7%
8%
519
flagIndia
26%
56%
8%
8%
303
flagthe Netherlands
25%
56%
8%
9%
62
flagUkraine
30%
55%
5%
10%
20
flagFrance
24%
54%
6%
14%
61
flagRepublic of Ireland
24%
52%
9%
13%
61
flagUnknown
28%
49%
7%
14%
417
flagSweden
52%
47%
0%
0%
21
flagCanada
44%
42%
4%
8%
50
flagthe United States
41%
41%
7%
8%
600
flagAustralia
43%
38%
11%
6%
44
flagMalaysia
48%
37%
3%
11%
27
flagPakistan
53%
35%
7%
3%
28
flagthe Philippines
45%
25%
22%
6%
31

Gender

men51%
women56%
citric acid
27%
25%
malic acid
51%
56%
lactic acid
8%
9%
formic acid
12%
8%

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Which acid causes the sourness of green apples?
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Author: Kasia
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