The question as phrased is nearly meaningless. However, the pH of coffee is generally somewhere between 4.5 and 6.
coffee is a weak acid
Weak
it is weak acid :)
It is a weak acid.
Weak.
It is a weak acid
Oxalic acid is a relatively strong weak acid. It has pKa1=1.27 and pKa2=4.28.
If you use strong acid it will eat the glass
It's a weak acid.
no it is a strong acid
Its a weak acid
Strong acid
A strong acid dissociates more completely than a weak acid.
i thing strong acid