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請問一下我想用MATLAB做雙重指示劑滴定

可是我中間的一段曲線跑不出來 有人可以幫個忙嗎?
以下是我的CODE
Mna2co3=0.1
Mhcl=0.1
Vna2co3=7.5
Vhcl=linspace(0,15,1000)
Vhcl1=linspace(15,30,1000)
Vhcl2=linspace(30,45,1000)
OH=(Mna2co3.*Vna2co3*2-Mhcl*Vhcl)./(Vhcl+Vna2co3)
poH=-log10(OH)
pH=14-poH
if OH.*(Vhcl+Vna2co3)-Mhcl*Vhcl1>0
OH1=(OH.*(Vhcl+Vna2co3)-Mhcl*Vhcl1)./(Vhcl1+Vna2co3)
pH1=14+log10(OH1)
elseif OH.*(Vhcl+Vna2co3)-Mhcl*Vhcl1==0
OH1=Mhcl
pH1=14+log10(OH1)
else
OH1=(Mhcl*Vhcl1-OH.*(Vhcl+Vna2co3))./(Vhcl1+Vna2co3)
pH1=-log10(OH1)
end
pH1
H1=(Mhcl*Vhcl2+(Mhcl*Vhcl1-OH.*(Vhcl+Vna2co3)))./(Vhcl2+Vna2co3)
pH2=-log10(H1)
plot(Vhcl,pH,Vhcl1,pH1,Vhcl2,pH2)
xlabel(' The volume of HCl ')
ylabel('PH')

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