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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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VD9: 2SO 4<br />

2<br />

n n 2n 0,04 (mol)<br />

n<br />

n<br />

n<br />

H<br />

OH<br />

2<br />

Ba<br />

2<br />

SO4<br />

HCl<br />

H2SO4<br />

0,6a (mol)<br />

0,3a (mol)<br />

0,01 (mol)<br />

Tính a<br />

+<br />

+ OH H 2 O.<br />

n n n 0,6a 0,04 (mol)<br />

OH (d−) OH H<br />

OH<br />

(1)<br />

pH = 13 [H + ] = 10 –13 [OH ] =10 –1 (M)<br />

n 0,1. 0,5 0,005 (mol).<br />

OH (d−)<br />

0,6a – 0,04 =0,005 a =0,075 M.<br />

(2)<br />

Tính m<br />

n<br />

2<br />

0,3a 0,0225 (mol).<br />

Ba<br />

BaSO<br />

2<br />

4 SO4<br />

2+<br />

+ SO 4<br />

2<br />

BaSO 4 .<br />

n n<br />

2<br />

Ba<br />

><br />

1 1<br />

2<br />

SO 4<br />

SO 4<br />

2<br />

n n 0,01 (mol) m = 2,33 (gam)<br />

E<br />

là<br />

(A) 4. (B) 3. (C) 2. (D) 1.<br />

F<br />

2<br />

(A) 13. (B) 2. (C) 12. (D) 1.<br />

8<br />

109

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