Kemija - 2018. jesen, 39.

A. $\mathrm{p}\mathrm{H}=6,8;c\left({\mathrm{H}}_3{\mathrm{O}}^{+}\right)=1,58\times {10}^{-7}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L};c\left({\mathrm{O}\mathrm{H}}^{-}\right)=1,58\times {10}^{-7}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L}\backslash mathrm\{pH\}=6,8\; ;\; ~c\backslash left(\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\}\backslash right)=1,58\; \backslash times\; 10^\{-7\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}\; ;\; ~c\backslash left(\backslash mathrm\{OH\}^\{-\}\backslash right)=1,58\; \backslash times\; 10^\{-7\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}$

B. $\mathrm{p}\mathrm{H}=6,8;c\left({\mathrm{H}}_3{\mathrm{O}}^{+}\right)=6,31\times {10}^{-8}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L};c\left({\mathrm{O}\mathrm{H}}^{-}\right)=6,31\times {10}^{-8}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L}\backslash mathrm\{pH\}=6,8\; ;\; ~c\backslash left(\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\}\backslash right)=6,31\; \backslash times\; 10^\{-8\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}\; ;\; ~c\backslash left(\backslash mathrm\{OH\}^\{-\}\backslash right)=6,31\; \backslash times\; 10^\{-8\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}$

C. $\mathrm{p}\mathrm{H}=7,2;c\left({\mathrm{H}}_3{\mathrm{O}}^{+}\right)=1,58\times {10}^{-7}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L},c\left({\mathrm{O}\mathrm{H}}^{-}\right)=1,58\times {10}^{-7}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L}\backslash mathrm\{pH\}=7,2\; ;\; ~c\backslash left(\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\}\backslash right)=1,58\; \backslash times\; 10^\{-7\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\},\; ~c\backslash left(\backslash mathrm\{OH\}^\{-\}\backslash right)=1,58\; \backslash times\; 10^\{-7\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}$

D. $\mathrm{p}\mathrm{H}=7,2;c\left({\mathrm{H}}_3{\mathrm{O}}^{+}\right)=6,31\times {10}^{-8}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L},c\left({\mathrm{O}\mathrm{H}}^{-}\right)=6,31\times {10}^{-8}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{L}\backslash mathrm\{pH\}=7,2\; ;\; ~c\backslash left(\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\}\backslash right)=6,31\; \backslash times\; 10^\{-8\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\},\; ~c\backslash left(\backslash mathrm\{OH\}^\{-\}\backslash right)=6,31\; \backslash times\; 10^\{-8\}\; \backslash mathrm\{~mol\}\; /\; \backslash mathrm\{L\}$