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Question: Why do I have this calculation problem

Question:Why do I have this calculation problem

FDS 180 Maple
elementwise tilde
September 13 2021
1

As a newbie I tried to do some simple calculations. Unfortunately one of my calculations does not solve. I assume I do not see the obvious. Would someone be so kind to help me out? Thank you
 

restart

with(LinearAlgebra)

pH := Vector(2, {(1) = 7.17, (2) = 7.25})

Vector[column](%id = 4598165698)

 (1)

pCO2 := Vector(2, {(1) = 74, (2) = 56})

Vector[column](%id = 4696862338)

 (2)

pK := 6.1

6.1

 (3)

CO2 := `~`[`*`](pCO2, 0.3e-1)

Vector[column](%id = 4696842050)

 (4)

HCO3 := `~`[`*`](`~`[`*`](0.3e-1, pCO2), 10^`~`[`-`](pH, pK))

Error, (in rtable/Power) exponentiation operation not defined for non-algebraic exponents

  

TCO2 := CO2+HCO3

28.30272572

 (5)

VCO2 := 22.4*(28.3-25.41)*5.9

381.9424

 (6)

NULL


 

Download test.mw
 

restart

with(LinearAlgebra)

pH := Vector(2, {(1) = 7.17, (2) = 7.25})

Vector[column](%id = 4598165698)

 (1)

pCO2 := Vector(2, {(1) = 74, (2) = 56})

Vector[column](%id = 4696862338)

 (2)

pK := 6.1

6.1

 (3)

CO2 := `~`[`*`](pCO2, 0.3e-1)

Vector[column](%id = 4696842050)

 (4)

HCO3 := `~`[`*`](`~`[`*`](0.3e-1, pCO2), 10^`~`[`-`](pH, pK))

Error, (in rtable/Power) exponentiation operation not defined for non-algebraic exponents

  

TCO2 := CO2+HCO3

28.30272572

 (5)

VCO2 := 22.4*(28.3-25.41)*5.9

381.9424

 (6)

NULL


 

Download test.mw

 
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