Kemiopgaver: beregninger og reaktionsskemaer

109 basiskemi B

m= p * V 1,18g/mL * 1000 mL= 1180 g

masse% * m(tot) 0,36*1180 = 424,8 mL

n = m/Mw = 424,8g/36,458g/mol = 11,65 g

c = n/v = 11,65mol/1L = 11,65 M

111.

HNO3 / NO3-

HNO / CN-

HF / F-

H2CO3 / HCO3-

HBr / Br-

I- / HI

CN-/ HCN

CO32-/ HCO3-

HCO3-/ H2CO3

H2PO4-/ H3PO4

113.

H3PO4 + H2O ? H2PO4- + H3O+

H2PO4 + H2O ? HPO4-2 + H3O+

HPO4 + H2O ? HPO-3 + H3O+

115.

NaOH + CH3COOH ? CH3COO- + Na+ + H2O

116.

HNO3 + NaOH ? NO3- + NaOH2+

117.

HCl + NH3 ? Cl- + NH4+

Amoniumchlorid

118.

H2O(l) + CO32-(aq) ? OH + HCO3

H2O(l) + CO43-(aq) ? HPO4-2(aq) + OH-(aq)

[H3O+]=[OH-]neutral

[H3O+]>OH-]sur

[H3O+]<[OH-]basisk

[H3O+]*[OH-]10-7 * 10-7 = 10-14vands ionprodukt

120.

pH = -log [H3O+] [H3O+] = 10^(pH)

sur