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
flagFinland
11%
82%
5%
0%
17
flagNorway
13%
70%
8%
8%
37
flagItaly
14%
68%
8%
8%
35
flagPoland
20%
65%
6%
7%
16426
flagGermany
16%
64%
9%
9%
178
flagBelgium
25%
62%
12%
0%
16
flagthe Netherlands
25%
60%
9%
5%
55
flagthe United Kingdom
25%
57%
7%
8%
469
flagIndia
25%
57%
8%
7%
271
flagRepublic of Ireland
18%
57%
11%
12%
54
flagSpain
23%
57%
4%
9%
21
flagUnknown
25%
50%
12%
12%
66
flagFrance
26%
50%
7%
15%
52
flagMalaysia
39%
43%
4%
13%
23
flagAustralia
37%
42%
12%
7%
40
flagthe United States
41%
41%
7%
8%
546
flagSweden
58%
41%
0%
0%
17
flagCanada
46%
40%
4%
6%
47
flagPakistan
52%
36%
8%
4%
25
flagthe Philippines
39%
28%
25%
7%
28

Gender

men51%
women57%
citric acid
28%
24%
malic acid
51%
57%
lactic acid
8%
9%
formic acid
11%
8%

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