Question

A chemist dissolves 877 mg of pure hydroiodic acid in enough water to make up 360 mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits. X $ ?

Answer 1

To Ginen! 877. mg of HI = 877x10 3 g и п. у Кит ь 123, 91 % (« или 4 н . 377 x16 * 127. 1) */ш. = 6. -4 , 1 к и н ь , , = 3, 2 x 69 wolume of so = 360 ml. Now, с т HT + 4, о + но* 6, gs: 4С 7 он - x 6. Қs6 -х L) Lo"] Сн1] - sro x, x 2 (6x56-) 1-то At Equilibrim (6-8 -x) Мис | THIJ = 360 ML що [7] . Сңі) - - - - 36б um Scanned wi CamScanner

2 260 360 * 3% 60 3,2x10 9 = 2 x 10 (6. 856-x) 360 7898.112 x10° - 1152 x 109 x = x? + 1152 x 10 x 78.98.112x1620 x = 6.8559 It means HI being very strong and Meer get wholly dissociated into nater prodreing 6.856 mmol of the ot 6.850 nmol = 0.019044 M [bot] = 6.87 pH = -log The or] =-log (0.019 044) pH = 1.72023 1.72 pH = s Ansurer Scanned with CamScanner

Grinen o 98 и от 1 нен, N, Oy- pH = 3, 33 ka. to find Г ) 1 : РН= 7. 13 2.32 – от 1ъв'] = - 3, 33 2 , C8x |0 г Ти, с'] : . 16 177 Now ц, N, о ңo — C, No +46" o О,98 + + x Но | — У 4. 6s хур 4. (хл" О 98 — Sv, H ң , о] . о. 93 – 4.6 g x64 . о. 92 9S3 [4ң, о, о-) Lo"] [нң, , os) CS Scanned with CamScanner

4.68 X 154 x 4.688 109 ka o. 97953 2.23 x 10 Scanned with CamScanner

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