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%
23803
flagIndia
33%
50%
7%
8%
869
flagGermany
27%
50%
9%
12%
77
flagthe Netherlands
30%
50%
11%
7%
26
flagFrance
23%
47%
14%
14%
21
flagNigeria
27%
38%
22%
11%
72
flagAustralia
48%
37%
9%
4%
105
flagGreece
29%
35%
23%
11%
17
flagPakistan
48%
34%
12%
5%
100
flagUnknown
40%
34%
14%
12%
50
flagRepublic of Ireland
40%
34%
15%
9%
32
flagthe United States
48%
31%
9%
8%
806
flagSouth Africa
48%
31%
17%
3%
29
flagthe United Kingdom
51%
29%
8%
10%
429
flagthe United Arab Emirates
58%
29%
8%
4%
24
flagMalaysia
57%
28%
3%
9%
52
flagCanada
58%
25%
7%
8%
56
flagSingapore
65%
24%
6%
3%
29
flagthe Philippines
55%
23%
9%
12%
65
flagIndonesia
48%
20%
32%
0%
25