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BÀI TẬP TRẮC NGHIỆM HÓA ĐẠI CƯƠNG VÀ VÔ CƠ CẨM NANG DÙNG LUYỆN THI THPTQG CHẤT LƯỢNG CAO (COLOR BOOK)

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3PO 4<br />

2<br />

3PO 4<br />

, có<br />

T<br />

n<br />

n<br />

OH<br />

H3PO<br />

4<br />

T<br />

VD2: 3PO 4<br />

Tính T<br />

n 0,04 (mol) n<br />

n<br />

OH<br />

H3PO<br />

4<br />

0,01 (mol)<br />

OH<br />

T 4<br />

n<br />

H3PO<br />

4<br />

T > 3 3PO 4<br />

3PO 4 + 3KOH K 3 PO 4 + 3H 2 O<br />

n n 0,01 (mol)<br />

K3PO4 H3PO<br />

4<br />

n n 3n 0,01 (mol)<br />

KOH (d−) KOH H3PO<br />

4<br />

<br />

nKOH (p−)<br />

m = 0,01.212 + 0,01.56 = 2,68 (gam)<br />

m K 3 PO 4<br />

m KOH<br />

D<br />

H 3 PO 4<br />

E<br />

A) 12,0. B) 14,2. C) 13,6. D) 16,4.<br />

A) 5,52 %. B) 2,81 %.<br />

C) 4,74 %. D) 6,48 %.<br />

4<br />

241

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