Which combination is not a buffer? nacn + hcn nh3 + nh4cl ch3cooh + ch3coona nacl + hcl

The combination of NaCl + HCl is not a buffer.

Explanation:

A buffer is the mixture of a weak acid with its conjugate base or vice versa. Thus:

The mixture of NaCN + HCN IS A BUFFER because HCN is a weak acid and NaCN is its conjugate base

NH₃ + NH₄Cl IS A BUFFER because NH₄Cl is a weak acid and NH₃ is acting as its conjugate base.

CH₃COOH + CH₃COONa IS A BUFFER Because CH₃COOH is a weak acid and CH₃COONa is its conjugate base.

NaCl + HCl IS NOT A BUFFER because NaCl is a salt and HCl is a strong acid.

I hope it helps!

the increase of protons   hope this

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer