5.
\(\rm{(1)}\)某温度\(\rm{(t℃)}\)时,测得\(\rm{0.01mol/L}\)的\(\rm{NaOH}\)溶液的\(\rm{pH}\)为\(\rm{10}\),则该温度下水的\(\rm{K_{w}=}\) ______ ,该温度 ______ \(\rm{25℃(}\)填“大于”“小于”或“等于”\(\rm{)}\),其理由 ______ \(\rm{(2)}\)此温度下,将\(\rm{pH=a}\)的\(\rm{NaOH}\)溶液\(\rm{V_{a}L}\)与\(\rm{pH=b}\)的\(\rm{H_{2}SO_{4}}\)溶液\(\rm{V_{b} L}\)混合,通过计算填写以下不同情况时两溶液的体积比:
\(\rm{①}\)若所得溶液为中性,且\(\rm{a=12}\),\(\rm{b=2}\),则\(\rm{V_{a}}\):\(\rm{V_{b}=}\) ______ ;
\(\rm{②}\)若所得溶液为中性,且\(\rm{a+b=12}\),则\(\rm{V_{a}}\):\(\rm{V_{b}=}\) ______ ;
\(\rm{③}\)若所得溶液的\(\rm{pH=10}\),且\(\rm{a=12}\),\(\rm{b=2}\),则\(\rm{V_{a}}\):\(\rm{V_{b}=}\) ______ .