Noen som er flinke i kjemi?

[AnonymBruker]

Har eksamen i morgen, men sitter bomfast på noen oppgaver i kjemi her. Hadde vært uendelig takknemlig om noen kunne løst disse for meg:

Oppg.1

A voltaic cell is composed of copper and zinc half cells. Its electronic force is 1.15 V, the ion concentration of the cathode is 0.45 M. Calculate the metal ion concentration of the electrolyte of the anode.

ε^0(Zn/Zn^2+) = -0.76V; ε^0(Cu/Cu^2+) = +0.34

Oppg.2

An aqueous solution is prepared by mixing the following solutions:

20 ml 0.1 M NaCl and 30 ml 0.1 M glucose. Calculate the freezing point of the mixture! The mole freezing point depression in aqueous solutions is 1.86 degrees/mol.

Oppg.3

1.4 g NaOH will be dissolved in 1 liter acetic acid (c=0.1 mol/L). Calculate the pH of the new solution! pKa=4.7 Molar mass of NaOH=40.

Oppg.4

Two different hydrochloric acid solutions will be missed. The one has a volume of 200 ml and a pH-value of 1; the volume of the other is 300 ml and its concentration is 0.365 w/v%. Calculate the pH of the new (mixed) solution!

Molar mass of Hcl = 36.5. Volumes can be considered additive.

Oppg.5

10 ml of a NaOH solution were neutralized by 11.75 ml 0.1 N HCl titrating solution (f=0.972). Calculate the w/V% concentration of the NaOH solution!

Molar mass of NaOH = 40g/mol

Tuusen tuuusen takk på forhånd!! Dere redder meg helt serriøst

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