Question

La fel ca si intrebarile mele mai vechi, sunt interesat mai mult de formule si metoda de calcul, decat de rezultate.

Answer 1

3. Vs = ? (L)
C = 0,2M

ms = 20g H2SO4
C = 49%

md = C*ms/100 = 49*20/100 = 9,8g H2SO4
n = m/M = 9,8/98 = 0,1 moli H2SO4

C = n/Vs => Vs = 0,5L

4. a. pOH = 2

pH + pOH = 14 => pH = 12

[H3O+] = 10^(-pH) = 10^(-12) moli/L

b. H2CO3

5.a. NaCl(topit) => Na + 1/2Cl2

b. 58,5g NaCl.............23g Na
234g NaCl..................x = 92g (mt)

mp = 80*92/100 =