When dilute aqueous solutions of two salts are mixed, the process is associated with

When dilute aqueous solutions of two salts are mixed, the process is associated with Correct Answer Increase in temperature

According to the first law of thermodynamics
$$\delta Q = dU + \delta W$$
So, as there is no heat exchange and assuming no work is done $$w$$ can write
$$\eqalign{ & d{U_{1\,\left( {salt} \right)}} + d{U_{2\,\left( {salt} \right)}} = 0 \cr & \Rightarrow m{C_A}\left( {{T_f} - {T_A}} \right) = m{c_B}\left( {{T_f} - {T_B}} \right) \cr & {\text{So,}}\,{T_f} = \frac{{{m_A}CATA + {m_B}cBTB}}{{{m_A}{c_A} + {m_B}{c_B}}} \cr} $$
So, the final temperature is dependent on concentration or composition.
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