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Human spinal fluid has a pH of 7.4. Part A Approximately what is the H3O+ concentration of spinal fluid? Express your answer
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we know that pH = -log[H3O+] or [H3O+]= 10^-pH

here pH= 7.4 ; [H3O+]= hydronium ion concentration

[H3O+]= 10^-7.4= 4*10^-8 M

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