Calculate the pH of each of the following strong acid solutions.
(a) 0.00293 M HI
pH =
(b) 0.899 g of HIO4 in 50.0 L of solution
pH =
(c) 61.0 mL of 3.80 M HI diluted to 1.50 L
pH =
(d) a mixture formed by adding 34.0 mL of 0.00899 M HI to 75.0 mL of 0.00271 M HIO4
pH =
(a) given 0.00293 M HI
[H+] = 0.00293 M
pH = - log[H+]
= - log(0.00293)
pH = 2.53
(b) molarity = weight/ (gram molecular weight * volume in L)
= 0.899 / (191.9 * 50)
= 9.369 X 10-5
pH = - log[H+]
= - log( 9.369 X 10-5 )
pH = 4.028
(c)
M = 3.80 X 61 x 10-3 / 1.50 = 0.154 M
pH = - log[H+]
= - log( 0.154 )
pH = 0.812
(d) total moles = 34 X 0.00899 + 75 X 0.00271 = 0.5089 moles
molarity = 0.5089 / (34 + 75)
= 4.67 X 10-3 M
pH = - log[H+]
= - log( 4.67 X 10-3 )
pH = 2.331
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