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
12%
69%
7%
10%
39
flagItaly
13%
67%
8%
10%
37
flagPoland
19%
65%
6%
7%
17634
flagGermany
16%
64%
9%
8%
194
flagSpain
20%
62%
4%
8%
24
flagthe Netherlands
24%
59%
8%
7%
57
flagAustria
29%
58%
0%
11%
17
flagthe United Kingdom
26%
57%
7%
8%
505
flagIndia
26%
56%
8%
8%
298
flagUkraine
30%
55%
5%
10%
20
flagFrance
25%
52%
6%
15%
59
flagRepublic of Ireland
25%
51%
10%
13%
60
flagUnknown
29%
45%
11%
13%
122
flagCanada
44%
42%
4%
6%
49
flagthe United States
40%
41%
7%
8%
588
flagAustralia
41%
39%
11%
6%
43
flagMalaysia
46%
38%
3%
11%
26
flagPakistan
55%
33%
7%
3%
27
flagthe Philippines
41%
27%
24%
6%
29

Gender

men50%
women56%
citric acid
28%
24%
malic acid
50%
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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