What is the reaction b/w skin and HNO3?

Question

i mean what is the yellowish thing formed on skin when HNO3 falls on it.

Answer 1

The yellow colour forms due to reaction between tissue proteins and conc.HNO3. it is a form of xanthoproteic test that v do for testing presence of proteins.

aromatic amino acids in proteins react with conc.HNO3 to form nitrobenzene with inc. temp (due to Rn b\w acid &water of tissues mixing)

white nitrobenzene intermediate changes to yellow product.

Answer 2

Nitric acid

Other names Aqua fortis
Spirit of nitre
Molecular formula HNO3
SMILES [N+](=O)(O)[O-]
Acidic Ion Concentration pH = -2 (1 N)
Molar mass 63.01 g/mol
Appearance Clear, colorless liquid
CAS number 7697-37-2
Properties
Density and phase 1.51 g/cm³
Solubility in water miscible
Melting point -42 °C (231 K)
Boiling point 83 °C (356 K)
Acidity (pKa) -2
Viscosity ? cP at ? °C
Structure
Molecular shape trigonal planar
Dipole moment ? D
Hazards
MSDS External MSDS
EU classification Oxidant (O)
Corrosive (C)
NFPA 704

0
3
0
OX
R-phrases R8, R35
S-phrases S1/2, S23, S26,
S36, S45
Flash point not applicable
RTECS number QU5775000
Supplementary data page
Structure and
properties n, εr, etc.
Thermodynamic
data Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Related compounds Nitrous acid
Dinitrogen pentoxide
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

The chemical compound nitric acid (HNO3), otherwise known as aqua fortis or spirit of nitre, is an aqueous solution of hydrogen nitrate (anhydrous nitric acid). It is a highly corrosive and toxic acid that can cause severe burns. Colorless when pure, older samples tend to acquire a yellow cast due to the accumulation of oxides of nitrogen. If the solution contains more than 86% nitric acid, it is referred to as fuming nitric acid. Fuming nitric acid is characterized as white fuming nitric acid and red fuming nitric acid, depending on the amount of nitrogen dioxide present.Verry Corrosive!Can cause serious burn-wounds,were gloves when handling,Don't let come in contact with organic materials,irritating fumes,...

Answer 3

When concentrated Nitric Acid falls on the skin it has the chemical reaction with skin and that part of skin becomes yellow

Answer 4

That is dehydrated protein.

Answer 5

I donno what thing is, but it hurts a looooot