The word(s) "acknowledge" appears 5 time(s) in 5 verse(s) in Quran in Muhammad Pickthal translation.

(1) And (there are) others who have acknowledged their faults. They mixed a righteous action with another that was bad. It may be that Allah will relent toward them. Lo! Allah is Forgiving, Merciful.

(سورة التوبة, At-Tawba, Chapter #9, Verse #102)
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(2) And they denied them, though their souls acknowledged them, for spite and arrogance. Then see the nature of the consequence for the wrong-doers!

(سورة النمل, An-Naml, Chapter #27, Verse #14)
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(3) And those who argue concerning Allah after He hath been acknowledged, their argument hath no weight with their Lord, and wrath is upon them and theirs will be an awful doom.

(سورة الشورى, Ash-Shura, Chapter #42, Verse #16)
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(4) So they acknowledge their sins; but far removed (from mercy) are the dwellers in the flames.

(سورة الملك, Al-Mulk, Chapter #67, Verse #11)
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(5) And in whose wealth there is a right acknowledged

(سورة المعارج, Al-Ma'aarij, Chapter #70, Verse #24)
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