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
flagGermany
28%
56%
4%
12%
25
flagPoland
26%
55%
7%
10%
20796
flagNew Zealand
33%
53%
6%
6%
15
flagthe Netherlands
23%
53%
7%
15%
13
flagIndia
33%
50%
7%
7%
540
flagFrance
30%
46%
0%
23%
13
flagPakistan
47%
38%
9%
4%
73
flagSouth Africa
38%
38%
23%
0%
13
flagRomania
46%
38%
0%
15%
13
flagNigeria
32%
35%
25%
7%
28
flagUnknown
40%
34%
14%
12%
50
flagthe United Kingdom
50%
32%
6%
10%
207
flagAustralia
50%
31%
13%
4%
61
flagMalaysia
56%
29%
5%
8%
37
flagthe United States
52%
28%
9%
7%
640
flagSingapore
69%
26%
3%
0%
26
flagIndonesia
50%
25%
25%
0%
20
flagCanada
60%
23%
4%
11%
43
flagthe Philippines
56%
21%
10%
10%
46
flagthe United Arab Emirates
66%
20%
6%
6%
15