3
Methyl orange is not suitable for Na2CO3-HCl standardization because the reaction involves a weak base (Na CO3) and a strong acid (HCl), giving an equivalence point in the pH range of about 4-5, which is outside methyl orange’s accurate transition range (3.1-4.4), leading to endpoint error.
Added 297 days ago|8/15/2025 7:31:45 AM
This answer has been confirmed as correct and helpful.