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
14%
68%
8%
8%
35
flagPoland
19%
65%
6%
7%
17296
flagGermany
16%
64%
9%
9%
188
flagthe Netherlands
24%
59%
8%
7%
57
flagSpain
22%
59%
4%
9%
22
flagthe United Kingdom
25%
58%
7%
8%
491
flagAustria
29%
58%
0%
11%
17
flagIndia
26%
56%
7%
8%
289
flagRepublic of Ireland
22%
53%
10%
13%
58
flagUnknown
26%
48%
11%
13%
108
flagFrance
27%
48%
7%
16%
54
flagthe United States
40%
41%
7%
8%
581
flagCanada
45%
41%
4%
6%
48
flagSweden
58%
41%
0%
0%
17
flagAustralia
40%
40%
11%
7%
42
flagMalaysia
46%
38%
3%
11%
26
flagPakistan
52%
36%
8%
4%
25
flagthe Philippines
41%
27%
24%
6%
29

Gender

men50%
women57%
citric acid
28%
24%
malic acid
50%
57%
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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