We investigate the existence of traveling wave solutions to the one-dimensional reaction-diffusion system
u
t
=
δ
u
x
x
−
2
u
v
/
(
β
+
u
)
u_t=\delta u_{xx}-2uv/(\beta +u)
,
v
t
=
v
x
x
+
u
v
/
(
β
+
u
)
v_t=v_{xx}+uv/(\beta +u)
, which describes the acidic nitrate-ferroin reaction. Here
β
\beta
is a positive constant,
u
u
and
v
v
represent the concentrations of the ferroin and acidic nitrate respectively, and
δ
\delta
denotes the ratio of the diffusion rates. We show that this system has a unique, up to translation, traveling wave solution with speed
c
c
iff
c
≥
2
/
β
+
1
c\geq 2/\sqrt {\beta +1}
.