Question

Ajutati va rog
De la inceput to cu schema

Answer 1

-calculez masa si moli acid din solutie

c=mdx100/ms---> md= 160x36,5/100g= 1,6x36,5gHCl

niu= m/M= 1,6X36,5g/36,5g/mol= 1,6molHCl

-din ecuatia chimica, deduc moli carbonat

1mol..................2mol

Na2CO3  + 2HCl----> 2NaCl + H2O+ CO2

x.....................1,6mol

x= 0,8mol Na2CO3

-calculez masa de carbonat, stiind M,Na2CO3= 106g/mol

m= niuxM= 0,8molx106g/mol= 84,8gNa2CO3

-calculez masa de solutie., stiind md= 84,8g

5,5= 84,8x100/ms..........................calculeaza ms !!!!!