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%
58%
5%
7%
53
flagthe Netherlands
17%
58%
11%
11%
17
flagNew Zealand
31%
56%
6%
6%
16
flagPoland
25%
55%
7%
10%
22587
flagIndia
33%
50%
6%
7%
706
flagSouth Africa
40%
40%
20%
0%
20
flagAustralia
45%
39%
9%
4%
83
flagthe United Kingdom
48%
34%
6%
10%
271
flagPakistan
48%
34%
11%
4%
86
flagUnknown
40%
34%
14%
12%
50
flagMalaysia
53%
33%
4%
8%
45
flagthe United States
49%
31%
9%
7%
732
flagNigeria
31%
31%
26%
10%
38
flagRepublic of Ireland
45%
31%
9%
13%
22
flagGreece
31%
31%
25%
12%
16
flagSingapore
67%
25%
7%
0%
28
flagthe United Arab Emirates
60%
25%
10%
5%
20
flagthe Philippines
56%
24%
8%
10%
57
flagCanada
57%
23%
8%
10%
47
flagIndonesia
54%
22%
22%
0%
22