Chemistry 122 Spring 2017 Hadder solution with a pH of 240 You have in font of y

Question

Chemistry 122 Spring 2017 Hadder solution with a pH of 240 You have in font of you 100 ml, of 700-10 MHCI 100 ml, of500 102 M NaOH and plenty of distilled water You start add HCIto a beaker of water when someone asks you a question When you retum to your dlution, you accidentally grab the assess the situation You have 85 0 mL of HCIand 870 mL of NaOH left their original containers. 81537509 Part A Assuming the sinal souson wabe dkned to 100 L, how much more HCI should you add to achieve the desied pl? Express your answer to three significant figures and include the appropriate units. Hints M Ansmrs Give Up Review Part Incorrect Try Again

Explanation / Answer

A)

V = 1 L, how much HCl should you ad to achieve desired pH

pH = 2.40

first, calculate H+

[H+] = 10^-pH = 10^-2.4 = 0.003981071 M

so

[HCl] = [H+] = 0.003981071 M

V = 1 L, so

mol of HCl = 1*0.003981071 = 0.003981071 mol of HCl

recall that

we have

M = mol/V

V = mol/M = (0.003981071)/(7*10^-2) = 0.0568724 liters =0.0568724*10^3 mL = 56.87 mL of acid required

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