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%
15772
flagGermany
16%
64%
9%
9%
170
flagUU
20%
62%
6%
10%
29
flagBelgium
25%
62%
12%
0%
16
flagIndia
24%
60%
7%
7%
247
flagthe Netherlands
25%
60%
9%
5%
55
flagRepublic of Ireland
18%
58%
9%
13%
53
flagthe United Kingdom
25%
57%
7%
8%
432
flagSpain
23%
57%
4%
9%
21
flagFrance
31%
44%
10%
13%
38
flagAustralia
35%
43%
12%
7%
39
flagMalaysia
39%
43%
4%
13%
23
flagthe United States
40%
42%
7%
8%
527
flagCanada
46%
42%
4%
4%
45
flagSweden
58%
41%
0%
0%
17
flagPakistan
52%
36%
8%
4%
25
flagthe Philippines
39%
28%
25%
7%
28

Gender

men52%
women57%
citric acid
28%
24%
malic acid
52%
57%
lactic acid
7%
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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