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%
16958
flagGermany
16%
64%
9%
9%
185
flagBelgium
25%
62%
12%
0%
16
flagthe Netherlands
24%
59%
8%
7%
57
flagthe United Kingdom
25%
57%
7%
8%
480
flagSpain
23%
57%
4%
9%
21
flagIndia
26%
56%
7%
8%
281
flagRepublic of Ireland
21%
55%
10%
12%
56
flagFrance
26%
49%
7%
16%
53
flagUnknown
30%
44%
12%
12%
86
flagthe United States
40%
41%
7%
8%
567
flagMalaysia
41%
41%
4%
12%
24
flagSweden
58%
41%
0%
0%
17
flagCanada
46%
40%
4%
6%
47
flagAustralia
40%
40%
11%
7%
42
flagPakistan
52%
36%
8%
4%
25
flagthe Philippines
41%
27%
24%
6%
29

Gender

men51%
women56%
citric acid
28%
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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