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+--- Thread: Chemistry Help. D: (/showthread.php?tid=8610)
Chemistry Help. D: - HooKarez - 2009-02-24
Acid/Base Equilibria : Do not want. There's another that I don't understand, but I don't feel like making the titration curve in excel, so yeah.
#4. A 50.0 mL sample of 0.100 M HCN (K[SIZE="1"]a[/SIZE]=6.2x10^-10) is titrated with an NaOH solution. The titration required 33.4 mL of NaOH to reach the equivalence point. Calculate the pH of the solution at the equivalence point.
#6. How many grams of solid Na[SIZE="1"]2[/SIZE]CO[SIZE="1"]3[/SIZE] must be added to 500. mL of a saturated solution of Ag[SIZE="1"]2[/SIZE]CO[SIZE="1"]3[/SIZE] to recude the [Ag+] to 1.5x10^-5 M? Assume that the volume change is negligible. (K[SIZE="1"]sp[/SIZE] Ag[SIZE="1"]2[/SIZE]CO[SIZE="1"]3[/SIZE] = 8.1x10^-12)
#7. How many moles of gaseous HCl must be added to 500. mL of 0.300 M NH[SIZE="1"]3[/SIZE] to obtain a buffer solution pH of 9.29? (K[SIZE="1"]b[/SIZE] NH[SIZE="1"]3[/SIZE] = 1.8x10^-5)
#15. Equal volumes of 0.1 M H[SIZE="1"]2[/SIZE]SO[SIZE="1"]3[/SIZE] and 0.1 M Ba(OH)[SIZE="1"]2[/SIZE] are mixed. Which ion, other than Ba[SIZE="1"]2+[/SIZE], will be in the greatest concentration?