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.
Kasia
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Answers by country

citric acid
malic acid
lactic acid
formic acid
answers
flagPoland
25%
56%
7%
9%
25182
flagGermany
23%
54%
8%
12%
109
flagIndia
34%
49%
7%
7%
975
flagthe Netherlands
30%
46%
13%
10%
30
flagNew Zealand
42%
42%
7%
7%
26
flagFrance
32%
40%
12%
16%
25
flagRepublic of Ireland
37%
37%
13%
10%
37
flagNigeria
28%
35%
20%
13%
123
flagPakistan
48%
35%
10%
4%
110
flagSouth Africa
48%
35%
13%
2%
37
flagAustralia
50%
34%
10%
5%
130
flagUnknown
40%
34%
14%
12%
50
flagthe United States
48%
32%
8%
7%
906
flagthe United Kingdom
51%
30%
7%
9%
520
flagthe United Arab Emirates
50%
29%
8%
8%
34
flagCanada
55%
28%
7%
7%
76
flagMalaysia
56%
28%
5%
8%
57
flagSingapore
68%
22%
5%
2%
35
flagthe Philippines
55%
21%
11%
11%
79
flagIndonesia
44%
18%
33%
3%
27