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
flagSwitzerland
11%
74%
7%
7%
27
flagNorway
9%
67%
9%
13%
53
flagGermany
16%
65%
9%
7%
242
flagPoland
20%
64%
6%
7%
23211
flagItaly
18%
63%
9%
9%
44
flagSpain
18%
62%
3%
11%
27
flagthe United Kingdom
26%
56%
7%
8%
589
flagUkraine
26%
56%
4%
13%
23
flagIndia
28%
54%
7%
8%
362
flagFrance
24%
53%
7%
13%
65
flagRepublic of Ireland
23%
53%
9%
14%
64
flagthe Netherlands
27%
52%
7%
11%
68
flagUnknown
28%
51%
6%
12%
968
flagSweden
41%
44%
6%
6%
29
flagthe United States
42%
41%
7%
7%
656
flagAustralia
41%
41%
10%
5%
55
flagCanada
43%
40%
5%
9%
55
flagMalaysia
46%
35%
7%
10%
28
flagPakistan
51%
32%
11%
4%
43
flagthe Philippines
51%
24%
18%
5%
37

Gender

men51%
women55%
citric acid
28%
25%
malic acid
51%
55%
lactic acid
8%
9%
formic acid
12%
9%

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